person who pretends to be all pro but really is a complete noob
The kid said he was the best at Street Fighter, but when he played with his peers, he lost consistently. His friends called him a Bui.
by RatedR April 19, 2006
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Function: adjective
Etymology: boo + -tay (as in booty)Date: circa 1986
1: junk.
thats some nice bui you got there.
by BUILICIOUS December 18, 2004
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"Boning Under the Influence" - Drunk sex, Similar to a DUI only it's when sex is involved instead of driving.

It's usually used when referring to the not so smart, careless, or stupid choices made when alcohol and sex mix.
friend: "I think I'm gonna bring him home after bars close."
you: "That's a BUI in progress!"
by saramaeo August 10, 2009
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An old joke in Runescape where you pay a large sum of gold in order to buy a gf.
guy: I have 10 mil. Buying gf.
other guy: I'm selling.
by thot eliminator March 13, 2018
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what is written next to every urban dictionary post but is never used because no one uses mugs. mugs are stupid
you shouldn't buy the mug
by doritofritocheeto April 26, 2016
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