A Japanese type word meaning roughly "is, be, are, am". It is very common in Japanese and usually put at the end of a statement.
watashi no namae wa mikeja desu.
by nihongolaa April 15, 2005
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A Japanese word commonly used to indicate the speaker is a retarded wannabe Japanese anime-whore

As in:

OMG, Inuyasha is the best, desu!

My WOW marriage fell through, it sucks, desu!

Do you like my new cat ears? I just bought them along with a large collection of leather belts, desu!

I am a massive power tool, desu!
by The W@tcher November 8, 2008
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A word that bears different meanings when used by those familiar with the Japanese language from those who speak not a lick of Japanese yet want to seem like they know what they're talking about, AKA your garden-variety weeaboo.

When used by an actual Japanese speaker, it roughly translates to "it is" and is an integral part of Japanese grammar. When used by your average weeaboo, it roughly translates to "I am a stupid American faggot who has no idea what the fuck they're talking about."
"Prussia is so kawaii, desu!"

"Shut up, you fucking Wapanese faggot."
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It a meme on 4-chan to let newfag's release the immense faggity inside them. It can also be used by trolls and other such assholes for the same reason. It is often spammed in ridiculous amount and pisses most people off. It has NOTHING to do with pwning or awesomeness.
4chan user- DeMotivational poster thread GO!!
Newfag-desudesudesudesudesudesudesudeusdeusdesudsuedusedesudesudesudesudesudesudesudesudesu... and so on
4chan user-shut the fuck up
by whitetip March 7, 2009
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"Desu" is the sound made by pwning. Conversely, by repeating "desu," you will have pwned your opponent(s), even if you already lost according to Godwin's Law.
lol pwned desu desu desu desu desu
by olvi November 27, 2006
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A suffix in Japanese language that you put at the end of a sentence.

It also is used to indicate an individual of Japanese heritage to make fun of the person due to its sound resembling the English word "death." (desu vs death)

Watashi wa otaku desu(death)

Mainichi desu(death)
by desudesuka July 10, 2008
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While everyone thinks desu means "is". That's not what it means. It is added to the end of a sentence to make it sound polite. Assuming a verb in the sentence is not already in polite form.
Note: Most sentences to not need desu to be grammatically correct.
Bob wa byouki desu. (Bob is sick. The "wa" means is. Desu just makes it polite.)
by Hikari-chan July 11, 2007
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