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(BY-STEE) a word used in San Diego, CA.

Meaning, Really messed up.
Marcus: Hey, Leilani, Malik said you look skinny.

Leilani: Malik, you're fucking dumb!

Marcus: Oooooh, she did you BEISTY.

Malik: What did I do sista?
by morsetiger January 16, 2009
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