a group of people asking for gum from one person. Usually started by a person who sees the chewer pop a piece in their mouth.
Chewer:wow, my breath smells, I need a piece of gum. (gets a pack out, and puts one in mouth)
Bob: can I have a piece?
Sue: Yeah, I wanna piece.
Joe: Hey, I need some gum.
Sam: Got any for me?
Chewer: Aghghhh, let this gum mob stop! I don't have anymore gum!