Outfielding 

The act in which a person gropes the butt of another. Generally while making out or at least as a sign of attraction.

It's not exactly a base, but still part of the game.

"Did you hear about Ben?"
"Yeah! He was outfielding Jessica!"

"How far did you get?"
"All the bases. And even got to the outfield."

"He outfielded Lilly all night. Everyone saw."

Outfielding by Chloecameupwiththis August 30, 2009