1 definition by thatguysfathersfriend

a slang term for a person who continuously flashes their butt, moon, on an alarming amount of occasions. so much so, one might actually need physiological help to deal with the trauma.
jeff: "geez, that guy's a moony loon."
lauren: "you got that right!"
by thatguysfathersfriend September 14, 2020
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