hit the stadium

participating in the activities leading up to, and including, sex. Or in simpler terms: to mess around, get it in, smash, etc.

the sex is usually just casual and has no strings attatched.

refers to the dome-like shape of stadiums which represents the shape of the male external sexual organs.

girl: so what are we doing tomorrow?

guy: we should hit the stadium ;)

girl: okay just make sure you bring some rubbers.