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your best friend's sister 

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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!
your best friend's sister by dawg69 June 21, 2009
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Related Words
your best friend's sister • Your best friend's girlfriend • Grab Your Best Friends Ass Week • hug your best friends day • National take your bestfriend's hoodie day • National post pictures of your best friends day • Expose your bestfriends day • National kill your bestfriends boyfriend day • National slap your bestfriends ass day • National suck and grab your bestfriends dick
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