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!