Underground Hammer
The act of have a finger shoved up a males ass while A) getting a blow job or B)Jerking off
She was blowin' the hell out of me and finished me off while giving me an underground hammer
Pump with an underground hammer
getting a handjob while the chick jams her thumb in and out of your ass.
So im getting a handjob from this ten dollar whore and the next thing you know im getting a pump with an underground hammer .