A sexual act where the female will jack a man off with the lips of her vagina, rather than with her ass cheeks in the ballpark.
"Baby, turn around and give me reverse ballpark."

Mijo: So what's new with you?
Tripas: Not much, just got some reverse ballpark last night.

"After winning the baseball game, Johnny went home and got reverse ballparked in honor of his win."
by Tripas12 August 21, 2011
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