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 02, 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 27, 2004
by Wolfpack69 October 28, 2008
by Joe Ernster esq. August 05, 2007
"buy" is the dance you do while you download music off the internet.(usually in an illegal fashion.)
by Michigan Man March 12, 2009
Dude, it's payday! Come on down to the bar, it's buy-in!
I'll be there....What's buy-in?
You're buying the first round. See you there.
I'll be there....What's buy-in?
You're buying the first round. See you there.
by KillAllHumans September 16, 2004