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Facial Hair: When a young man, not yet able to grow a tasty moustache, grows about 8-9 hairs on his upper lip. It only slightly resembles a moustache, but more-so resembles poop.
(Can also be called a dirtstache, shitstain, or mancrap)
You're a doofus, Carl, shave your poostache
by Jesse O. Roy February 19, 2008
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2
1. The unsightly, visible hair on a man/woman's upper lip that isn't quite mustache material, but is reminiscent of a pubescents upper lip hair.

2. A deposit of excrement on the upper lip of one who has recently commenced the act of taint/vaginal tongueing on a subject residing in the doggy style position .

3. The jovial result of a dirty sanchez.

"Check out that bitch's poo stache"

"I wonder if that kid know's his poo stache makes him look slow"

"I'm never doing that again, it gave me a fucking poo stache"
by Michael Sandman January 17, 2006
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3
A fecal mustache, acquired from excessive ass kissing.
Nice poostache, Jenny. You been kissing a lot of ass at work lately?
by pc1018 May 15, 2007
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4
1. The unsightly, visible hair on a man/woman's upper lip that isn't quite mustache material, but is reminiscent of a pubescent’s upper lip hair.

2. A deposit of excrement on the upper lip of one who has recently commenced the act of taint/vaginal tongueing on a subject residing in the doggy style position .

3. The jovial result of a dirty sanchez.
"Check out that bitch's poo stache"

"I wonder if that kid know's his poo stache makes him look slow"

"I'm never doing that again, it gave me a fucking poo stache"
by Michael Sandman January 18, 2006
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The vengeful act of crapping on a lover's chest while they sleep.

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5
A prank usually played on a sleeping individual. The giver of a poostache takes a finger to his own buttcrack until said finger is ripe with stink. Giver then rubs finger across upper lip of receipient. Also know as a stinky sanchez.
Mikey gave Nate a poostache while he was a'sleeping.
by uh da cheat October 28, 2004
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6
a moustache that looks like it was rubbed in with poop.
"that faggot ass white boy has a poostache"
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The vengeful act of crapping on a lover's chest while they sleep.

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