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!
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