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 2, 2010
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He went to buy sneakers
by Rory October 6, 2002
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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.
The buy-in for the annual World Series of Poker is $10,000.
by PsyMar June 27, 2004
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The state of mind where one is mentaly retarted due to the use of illegal substances.
I want to get buied this weekend.
by Wolfpack69 October 28, 2008
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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 5, 2007
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"buy" is the dance you do while you download music off the internet.(usually in an illegal fashion.)
Btw, I'm doing the "Buy" while I download music XD
by Michigan Man March 12, 2009
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A nasty scam we used to pull on new employees when they got thier first full paycheck
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.
by KillAllHumans September 16, 2004
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