It's when mostly people who have just saggy bellybuttons or have/had a bellybutton piercing and they
take it out and their belly bellybutton looks
shriveled up and
literally is like a butthole on your belly.
Friend 1: "look
over there at
that girl in the crop top"
Friend 2: *looks twards girl*
Friend 1: "yo shes got a bellybutthole!!"
Friend 2: " yoooo her
bellybutton does look like a butthole!"