an elongated stain in the rear of one's underwear caused by one of the following: 1)rubbing of the underwear on an insufficiently wiped anus after excrementing 2)expelling juicy farts (butt cheese) into the underwear over an extended period.
"I think my underwear has a skid mark from farting all day"
1) slang for a male homosexual 2) any male who gives anal sex to a woman or a man 3) a person who inserts objects into another persons ass.
"John loves the gay bars. He knows he'll meet plenty of poop pushers there."