A really annoying mark on the sitting part of some sort of chair or seat; A person who ruins your day
Person 1: "Dude I spilled my beer all over my car!"
Person 2: "Real seatstain you got there"

Party Atendee 1: "What a fucking seatstain"
seatstain *Flips chairs and eats all the pizza*
by seatstain November 13, 2021
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seatstain
seatstain: exists
person 7: "Aw fuck"
by seatstain November 13, 2021
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