2 definitions by Dickiesgirl4u

It means to insult someone repeatedly (verbally-usually using things about them, yo mama jokes, etc)
Damn Joey, you was straight gunnin on his ass
by Dickiesgirl4u August 4, 2004
It came from the movie how high, it means for 2 people to be gunning on eachother back and forth. Also after each insult everyone around yells "Get em"
1: You so ugly, your birth certificate was sent to your parents with a sorry letter from the condom company

Everyone: Get em!!!!!
by Dickiesgirl4u August 4, 2004