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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1.
An irritating individual that you call a friend but you don't really get on with due to
a) the fact they are a sponger
b) they c..
1.
refers to a girls vagina who sleeps around and may have a sexually transmitted diseasestd
Adam: I slept with Wendy last night.
Steve: ..