A form of "bust", as in ejaculating. Can be used to say if anything or anyone is attractive.
Fett: "Damn, she's Bost"
BS: "Fett... that's a dude"
by BS July 22, 2004
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a small furry animal that defies the laws of cuteness.

or, slang for best friend.
dude your cat is such a bosta cat.

hey bosta! whats up?
by davidthedudeman October 04, 2008
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To shag from behind in a forcefull manner
gonna go home tonight and give our lass a good bost
by Dave March 23, 2005
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unit of measure that represents the number of banana hammocks that pass a given point during one elapsed second.
When Damon when into the gay bar, he was excited to see that the "action" was moving towards him at 3.3 bost. This aroused him.
by CitizensAgainstUtilikilts January 19, 2009
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clan tag on Call of Duty 4, 5, and 6. it means you want to boost your XP
put your clan tag as BOST to and find others with it to boost up your XP
by JohnLennon090= June 26, 2010
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When someone is acting up or Someone do some stupid stuff or you acting retarded
Yo u acting real bost right now homie
by Kissmebrisha February 11, 2019
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