When a man fully inserts his penis into the anal passage (
male or
female) and rest his balls on the gluteus
maximus thus the formation on buttballs occurs.
(Exp.1)Man George, You were so drunk last
night Alex T. got in that
ass so far he gave you the worst
case of buttballs ever and left you a rash. Here is the picture.
(Exp.2) BITCH SHUT THE FUCK UP BEFORE I GIVE YOU BUTTBALLS!