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Form of online speak used in a forum, short for "Ban This Idiot". Used when a poster on a forum talks or behaves in such a manner that he or she merits being banned to prevent other users from having to put up with such idiocy again.
Poster 1: hey u all sux so much why u use this lame forum?

Poster 2: BTI
BTI by Squishy Carpet February 7, 2006
Related Words
BTi BTICH BTIF BTIAS BTIAM btib Btibana btie btiglo btihel
Acronym for Break The Ice;

BTI is the chillest TTC member, should have won coolest member, has a very large penis, is a class act, and ran a train on Jimmy's mother. Also known for having a mother who is a friend of the TTC and is a ROBLOX Youtuber.
Person 1: OMG! It's BTI!
Person 2: No way? That's the dude who had sex with Jimmy mom!
BTI by Class Act Profile Manager February 22, 2021
Hip Hop group consisting of THC Chofius Deadbeat and Rednekk Sam
BTi by bti August 29, 2003
A big, tall idiot. Doesn't necessarily have to actually be an idiot, just look like one. Used as an indicator of fuckability.
I would totally do John Mayer. He's such a BTI.
BTI by erin January 1, 2005
crew of 3 potheads who like to rhyme
THC, Chofius, and ATM
BTi by THC July 10, 2003
Bollocks to it... When you can't be arsed to do something.
Dens "Hey dude, are you going to do that essay for university tomorrow?"
Henery "No mate, BTI."
BTI by Henery and Dens August 15, 2007