When your butt is saggy and it appears to have a foreskin, therefore your rump (bum) has a foreskin.
Chad: hey bro look at that saggy ass
Jim: oh shit bro, she has a rumpleforeskin
Chad: nasty bro,just nasty
Jim: oh shit bro, she has a rumpleforeskin
Chad: nasty bro,just nasty
by Andybobandy May 5, 2018