Acronym for "Stomach to Tit Differential"
A rating system by which the females breasts are judged by the relation to their own stomach.
*As made famous by Cicchelli "the Bull"*
I.E. Due to Pamela Andersons tiny waist, she has great STD.
on the complete opposite end of the spectrum, despite her wealth and use of the word "Va Jay Jay", Oprah Winfreys stomach makes her have bad STD
© 1999-2015 Urban Dictionary ®
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