Usually refurring to when a girl has a mustache. A Dirty Pistachio can be seen if you watch the porn film, Hairy Lesbians Gone Wild, on the pornstar Morgan Lewis. This normally means that this chick has a longer mustache than the man!
Wow that cougar has a Dirty Pistachio
OR
I had sex with that Dirty Pistashio last night
OR
I only date girls with Dirty Pistashios
OR
I had sex with that Dirty Pistashio last night
OR
I only date girls with Dirty Pistashios
by A.Dot Dizz December 6, 2006
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