stab some gash

The act of using your erect penis to penetrate a vagina. Was mentioned in the movie "Pain & Gain" in a scene where Michael Rispoli (Frank Griga) invites Mark Wahlberg (Danny Lugo) to go out and stab some gash (find girls for sex).

Ey Mikey, let's go find a few broads and stab some gash.
I was in Miami last summer and I met so many girls, I was stabbing gash.