Top Definition
It's a system whereby you can subtly let your friends know your opinion on a girl's appearence
Shaun: Lisa was looking real good last night man.

Dave: I dunno man, She's a 15...

Shaun: A 15?

Dave: Like a 15 in Blackjack, you don't know whether you'd hit it or not... Blackjack Rating dude!

Shaun: LOL
by iKielo1 December 26, 2008
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