Abbreviation for "also known as," useful when defining terms that are known under two or more names:

Shortwave radio, a/k/a World Band radio; or

Taiwan a/k/a Formosa.

Also pseudonyms vis-a-vis given names:

Victoria Beckham a/k/a Victoria Adams and Posh Spice.

A simplified use has more recently emerged: simply to type the letters. omitting the slashes (a/k/a "virgules") in between -- it is rare that anyone would confuse "aka" with a word called something like "akk-uh" and "aka" is easier to type:

David Johansen aka Buster Poindexter.

Reginald Dwight aka Elton John.

But both spellings are currently in use:

Do you have any biographical information about writer George Orwell, a/k/a (or aka) Eric Blair?

Although an abbreviation, note that no period is required.

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from a Wanted poster: Wanted: Johnny Breeze, a/k/a John Brahms, a/k/a John Briscoe, a/k/a John Buchanan . . .

(contributor's note: not a real person).
by al-in-chgo March 5, 2010
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plus karma/kudos. used in forum threads, complementing a poster for his/her efforts
someone posts the new photoshop cs4 for pirating...
all the websurfers saving thousands of dollars in software:

"you are freakin awesome! +k"
"thanks bro worked like a charm. +5k" (a site's rating of 5 out of 5)
"nevermind i found a patch that took care of the problem. +karma to you"
by fumanwoo December 17, 2008
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A snake sticking its tongue out. Usually used when someone disses you and/or just cozz snakes rule.
Person1: Want pudding?

Person2: Yusssss.

Person1: I doesn't have any.

Person2: :K
by greatersouls December 22, 2010
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Word based in San Anselmo. It means to accept an idea sarcasitcally.
Dan: I love huge dicks.
Joe: 'k'.
by Joe 'K' January 23, 2009
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When you say 'ok' but you really mean fuck off
John "Can i please borrow some money?"

Joel "No-k".
by Boosty Collins May 27, 2009
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A fighter with amazing skills from the SNK fighter series "The King of Fighters". He first appeared in KOF '99 and was the hero of the NESTS saga. He hates exercising and fights by using pure violence.
Chain Drive: d,df,f,df,d,db,b + AC
by some punk kid May 2, 2005
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