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A 12:30 is a when you come across a girl and you can't pinpoint her age. She looks as if she can be either 12 years of age or 30.
-Damn bro, you see that girl over there? I can't really tell how old she is.

-Oh yeah man, I don't know, she looks like a 12:30 to me.
by TheManIKnow December 26, 2017
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