An acronym for the term "Tits On Parade", used to describe a female's attire where the cleavage and/or breast is revealed and accentuated for all to see.
"Woah man, check out the skirt on that! And that shirt is over the T.O.P.!"
"Damn right that's some good T.O.P."
T.O.P. Is a acronym for "Train of Pain" It is where you and your friends all fuck a girl one after the other aka Train of Pain.
"Hey man that bitch is fine lets do the T.O.P. on her!"
"Hey bitch you ready for that T.O.P.?"
"Eh yo B you fittin to try that T.O.P."