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To Masturbate. Originated from a person named Harry Cui, who was believed to have masturbated at least 10 times a day. Suspected of even ditching friends and parties to do it.
Person 1: Oh man I'm sorry dude I have a ton of homework, I can't get out.
Person 2: Bullsh*t, you just want to cui.
by Jason Backster April 26, 2004
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Verb: To Masturbate. Can also be used as a noun (e.g. "I love the cui").
Person 1: "Man that was a good cui".
Person 2: "Nothin like cuiing in the early morn".
by Adam Gablowsky April 29, 2004
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To masterbate alot, even though alot of people wont say they cui they really do. This guy named Joey i know does it.
Ricky: What are you gonna do man?
Joey: I might go home and cui some more
by Dirty white boy March 11, 2005
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5
A different term for the abbreviation lol. Cui is the abbreviation for 'Crack Up Inside'
Instant Messanger 1: you smell lyke dog shyt
Instant Messanger 2: lol

::now with cui::

Instant Messanger 1: you smell lyke dog shyt
Instant Messanger 2: cui
by Joey September 04, 2004
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n., pl.; the plural form of "cuz"; two or more good friends, buddies, homeys, homeslices, etc.
I'm chillin' with my cui.
by KFan II May 19, 2010
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7
Crafting under the influence in regards to starcraft 2. It is highly advised to not craft while one is under the influence. you'll be saying gg and hearing pwnd before you know it
dude i was CUI the other night and i got proxy pylon'd like a total n00b.
by CTcadet August 14, 2010
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