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A tootstain is a stain that leaves a wet, yet soft poop stain in the underwear, caused by a quiet fart.

Not to be confused with fartstain.
Jane Doe: "fffffff"
John Doe: "What the hell was that, honey?"
Jane Doe: "I believe I just tooted!"
John Doe: "That sounded wet."
Jane Doe: "Oh damnit, it looks like I gave myself a tootstain."
by Mary Jizzle May 06, 2008
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