When something's REALLY important. The tags "bold," "underline," and "italicize" begin with the letters BUI, hence the term. When someone using BBCode BUIs something, you know shit's about to go down.
Oh damn, he BUI'd "but." There had better be a good reason.
by MegamanTTEX November 02, 2010
Top Definition
A Vietnamese last name.
Bui is a common Vietnamese last name, but not as common as Nguyen.
by versai July 10, 2008
The sweetest love is bui
by too long September 09, 2003
1 )a person of Vietnamese decent who has a knack for hooking up good couples together and is usually super nice and outgoing to everyone

2) an Asian that loves to Rock more than you

1) wow ,that bui kid just got me hooked up with this hot woman from Sweden !

2) dude , it isn't a party without a bui in the house !
by Burgermister April 16, 2009
Most used Bahamian slang term. Has many uses such as emphasizing a command that follows it or replacing certain words, such as boy.
BUI you ugly dread.

by Freeportboi January 03, 2010
Operating a watercraft (Boat) under the influence of drugs or alcohol.
When the DNR officer boarded my vessel I blew a .12 so he gave me a BUI.
by Joe Ernster esq. August 05, 2007
Biking under the influence
Damn, I got a fucken B.U.I. last night.
by joshnu July 11, 2008
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