A sawed-off shotgun, retrofitted with a handle at the stock. Note: the gun must be a 12 gage pump to be an official pistol grip pump. Originated in Detroit on the south side alleys.
Riding in J's 64 Impala, I held the pistol grip pump on my lap at all times, waiting for suckas to play with my shit.
by Slippy Steve February 15, 2005
the act of anally fisting a mans ass while jacking him off. as if you are shooting a pistol grip pum shotgun
by victhespic July 16, 2011