Gas her back end

Bro 1: Bro I wanna hit up this thottie but I don't know what to say
Bro 2: Bro just tell her you're gonna drug her and gas her back end.

Bro 1: Bro I wanna talk to this girl but I'm not sure what to say to her.
Bro 2: Bro just tell her you wanna gas her back end.