Sex with someone with a familial relationship, but no bloodrelationship. Sometimes treated as incest in the law, but not as much of a taboo subject in common society.
"Dude, she's not my mom! She just married my father."
"So that's pseudo-incest. Still illegal in this state."
Carl: "your mum gay"
John: "your dadlesbian"
Carl: " your granny tranny"
John: "your grandpap trap"
Carl: "your sister a mister"
John: "your family tree LGBT"
Carl: "dont make me do it to em."
John: "do it Carl"
Carl: "your ancestors incestors."
John:
Carl:
John:
Carl: "you know i had to do it to em"
God: 'bows down before Carl'