when you take 2 ugly girls with nice bodys and brown bag their faces. Then you have one lay on their back and you fuck them while the other girl has her pussy in the face of the other girl. You have become a brown bag sandwich
Chris-"What did you do this weekend?"
Graham-"I brown bag sandwiched these two girls from PSHS. It was great!"
Chris-"Dude thats fuckin nasty!"