a male who is a heavy cummer, i.e. shoots more ejaculate during orgasm than the typical male, and who also posseses good control of his shot, making it shoot big globs of cum like bullets.
Yo girl the guy I brought home last night had the best gat cock ever.
Randall is not only well hung but my boy got gat cock.
A male member that shoots bullets.
Ex. 1- OH MY GOD, there are holes all up in me, he secretly shot me with his gat cock. I am peeved.
Ex. 2- FUCK I AM DEAD FROM YOUR GAT COCK
Ex. 3- Hey baby, give me all of the money in the cash register or else i will shoot you with my penis that is a gun, aka a gat cock.