the lint that collects in the recesses of a girl's ass. It is not discovered until the wiping of the area or an unexpected surprise by a person attempting to go doggy-style on the chick
Jarrod: "yo man I got inta some scary shit last nite bruh"
Jaquan: "Ah u mean when u went home with that chick. SHe a strait freak?"
Jarrod: "Yeah well I was bout to hit it from the back man and found out she had some BOOTY JAM!"
Jaquan: "U still hit dat?"
Jarrod: "Man u know how it be."