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.
by MegamanTTEX November 3, 2010

The amount of money required to buy a spot in a poker tournament. It's also generally your starting amount of money in the tournament.
by PsyMar June 26, 2004

by Wolfpack69 March 5, 2009

by Joe Ernster esq. August 6, 2007

"buy" is the dance you do while you download music off the internet.(usually in an illegal fashion.)
by Michigan Man March 11, 2009

"Hey, check out my new Brita water filter. Go ahead have some water - it tastes so good."
"You're so Bui."
"Hey, you wanna go out to eat?"
"No, I'm gonna stay here and study for my exam?"
"When's your exam?"
"In 3 weeks."
"You're so Bui."
"You're so Bui."
"Hey, you wanna go out to eat?"
"No, I'm gonna stay here and study for my exam?"
"When's your exam?"
"In 3 weeks."
"You're so Bui."
by Brett Hendar March 7, 2009
