What is Your Best Friend's Sister?
1.
a stupid comeback phrase that's used for virtually everything, even if it doesn't make any sense whatsoever
Friend #1: dude! i saw your mom last night! she was hot!
Friend #2: your best friend's sister!
Friend #!: you have a sister!?
dude: what happened last night!?
dude 2: your best friend's sister!
dude: shut up!
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A phenomenon that occurs only at parties, wherein the female revelers will begin acting in a homo-erotic manner to impress their male da..
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The act of eating a girl's pussy after cumming in it, causing cum bubbles to form in the vaginal cavity.
Man, I was eating my girl..
