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2.
When a male with facial hair performs oral sex on a female who hasn't showered recently, his moustache and beard will pick up the odour of the female's genitalia. When this happens the male will be carrying a pusstache on his top lip until he's able to wash his face.
Huey: 'I had too many beers the other night and went home with that sweaty girl who works behind the bar.'
Dewey: 'Don't tell me you...'
Huey: 'I must have done, because the next morning I had a pusstache so strong it made the flowers in my kitchen wilt. and they were plastic!'
by Carpet Muncher November 27, 2006
 
1.
The pubic region of a female.
Pusstaches come in 3 common designs: The hitler, the pirate and the Pontiac.
by Raish/G Money September 18, 2006
 
3.
A pussy mustache
I like your pusstache.
by Janos C February 10, 2011