To dog feast (or dog feasting):
a) Taping some ass
b) Doing your shit with your bitch
c) Getting somewhere with a girl
d) Macking on a chick
Basically, getting some ass.
Guy: "Yo, can you reach Ahmed's at lunch?".
Guy 2: "Nah nigga, I'm dog feasting.".
*walk into room*
Guy: "I just had a massive dog feast."
Everyone else: "Nice!"