Most vulgar phrase for doing "the nasty"
Best I heard was from my buddy (who's from Tennessee - only he can do it in his accent) "pumping baby batter past the pee flaps"
...and I have a dozen or so black eyes to attest to that.
whacking junior behind the ear, Heaving a Havana, ............... I could go on and on.......
you've had sex? I'm just paying for the ladies time