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1.
Adjective used to describe an ugly girl or group of girls. The thought being that 12 x 12 = 144... 144 = a gross. 12 x 12 = gross.

twelve by twelve
12 by 12

Justin: hey, i dont remember what that girl looked like that i hooked up with last nite...

Joe: bro, she's was 12 x 12.

Justin: ..... figures.
by Justin 10E March 07, 2008