Sorry, but I am not mother-tongue, so from time to time I stumble upon language usages that probably are not available in books.
In a thread on this forum, two of our beloved members where having a discussion, claiming that one (and the other would claim this reciprocally) would do a “duuh statement”. Now I tried Wikipedia but it is not there. I found some hints on Google, but I am not sure to have well understood the origin of this expression, nor did I catch 100% the “register” (is it offensive, if yes how much) of it. Even the exact meaning is not totally clear. The only thing I found was the sentence that a “duuh statement” is attached to the “letters of lawyers who do not see the obvious”. but I do not think this is accurate.
If anybody can teach me the meaning I will be happy. Feel free to join any slang expression (and it’s usual English correspondence of course) that may be of common use on the net or on the forum (and please tell me before that it is rude or offensive saying that…) 
most often a “duh” means the person it is being directed at is a bit
dull, stupid, not very smart at all…so much so that it should be
obvious to all observing…
so, if Person A says something (like say) “Compared to openSUSE
Windows ROCKS and cost less too!” and Person B answers “What planet do
you live on? Duh” then Person B might as well say: “That is the most
stupid thing ever uttered by a living creature and proves you are not
smart enough to install or use openSUSE”.
however, saying ‘duh’ will usually make it past the
moderators…whereas the latter will probably get you in trouble…see?
watch:
http://www.youtube.com/watch?v=oyDOXUtp1EQ
read:
http://www.answers.com/main/ntquery?s=duh
http://www.urbandictionary.com/define.php?term=duh
http://en.wiktionary.org/wiki/duh
–
palladium
https://www.youtube.com/watch?v=oyDOXUtp1EQ)… lol!rotfl!rotfl! No way! Mooooaahahahahhahhha!!!
They are seriously brain-dead or are these fake personalities?
Thanks for posting.
PS. very interesting the nearly “historical” origin (1963) of this expression. And to think, that I never noticed it before, not even in movies.
Weired.
a “duh” word is usually used when something is very obvious but the other party is, sometimes, failing to see it or says something in a discussion which is redundant.
Something like; hey, I’m gonna install this OS but first I need a computer
Someone may reply to this… Well, duh. Of course you’ll need a computer. That’s pretty obvious. On what else are you going to install the OS? On your house, shoes?.. (not even mentioning that you can’t install the OS on a house or shoes)
Well, that depends, they already try with washing machines and I would expect “Billy Boy” is working on the house thing. I already imagine it: “So how is your new villa?” “Oh had some problems with the new “Windoors 2030 professional”. The doors did shut when you wanted to get in, the shower was boiling or freezing and when you did switch on the TV there was only a blue-screen. Then I installed Openlinuxvilla 22.2 and everything worked. And to think they wouldn’t sell me the house without the expensive Windoors…”
But yes, I got clear now the meaning. But not if it is “offensive”. You would use it clearly only in a conversation with a person that is familiar to you? Or is it so “light” that the other does not even notice it? Or do one take it with “humor”?
I was talking about installing it on the house bricks themselves or on the material of the shoes. There are “intelligent” houses and clothing, but they all have integrated computers, so you’re installing it on the computers, not on the house bricks themselves 
About offensiveness, it depends. Some don’t see it as offensive, some do. It sometimes gives to some people a sense of being dumb or that you’re the “superior” person when you say “duh” since they missed the obvious but you didn’t
In spoken conversation it is easy to detect if a colloquialism such as "duh"is used in a sarcastic, offensive or a friendly manner.
In written conversation you need to catch the emotions behind its use by being either familiar with the person posting it, or able to read it from the context of the post. Reading comprehension is often lacking by many so this does not always work out successfully. Emoticons evolved to help with quickly conveying the import behind a statement that could be ambiguous to its meaning. However there are some that take Emoticons as a affront to their sensibilities.
Always best to read things twice if unsure to the meaning and ask before getting too upset with a written comment.
Duh Man.
Fellow forum member Akhoel (or something like that) will strongly disagree with you on this
According to him, people who use too many or too often emoticons are all retarded and he argued in the past that instead of using them, one should use words instead.
In the end, this erases the very well known phrase of “a picture says a thousand words” which very often is true 