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one who has SHIT in their pants due to very poor ass whipping skills or someone who has run out of toilet paper
holy shit dude you have poop stains in your undies
by Nicole Davis January 18, 2009
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2
A very prudish uptight person that gives no good reason for not having any fun.
Michael refused to have a glass of wine with me because he insisted that it would give him a horrible headache and that he needed to get to bed before 8:00 p.m. anyway. Michael is illustrating poopstain like behavior.
by Amecyst January 10, 2006
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4
The poop stain is how the dumbshits tell the front of their underwear from the back.

Also the poop stain can be what you would find on a towel that some chick used to wipe herself after anal sex.
dumbshit thinks in the morning "brown back, yellow front.. good thing i can tell from the poop stain."

that bitch left a damn poop stain on my towel.
by Rhynoo June 28, 2005
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5
A uninteligent person, also can be a term of endearment.
Oh you little poopstain you.
Look at that poopstain, what a dork!
by Mathew Cunningham May 08, 2003
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6
If someone takes shit or craps and it leaves a stain its referred to as a poop stain
Look kyle left a poopstain
Somebody clean up that poopstain
by Anonymous October 19, 2003
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