Top definition
a girl who puts out; short for bustdown; a slut, whore, skank, etc.
Guy1: So did you end up getting with Lauren?
Guy2: Nahhh man she's a bustie.
by acoolkid August 14, 2009
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2
People who have just met and bond over drinking
Hey meet my bustie, we love to drink
by Rodstar August 18, 2017
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