when a man goes down on another man's perineum. As opposed to cunnilingus.
"Dave, do you fancy some perilingus tonight?"
when a man cuts his perineum longways to resemble a vagina for the purpose of sexual intercourse, mainly with a MAN!
"then he punched me to the floor, took my trousers off, splayed my legs forcefully and took out a knife and gave me a san fransisco slot machine ill never forget"
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