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 5, 2011
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Individuals that reside in a trailer park and commit great acts of greatness and stupidity
After chugging 24 beers and passing out, Kyle was crowned the "Square Box Hero" of the day.
by The KC Huckster July 6, 2023
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