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Someone with a square ass. square being blocky, and box referring to ass. Normally associated with girls with shapeless square asses and spongebob. Consitered vulgar and innapropriate to some.
Me:"yo that girl over there has such a Square Box"

Guy:"Thats my girlfriend you fucking retard dyke!"

me:"lol oops"
by Bdogiovine December 04, 2011
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