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7.
A woman of loose moral character.
Further, a woman that one takes home for the night.

Coming from the Ludacris line "I was with some nasty ho's eatin' pistachios."
"Alright, you can have the room tonight, I'll sleep in the lounge. Just make sure that this pistachio doesn't touch any of my stuff."
by PH Loom June 01, 2007
 
1.
Used as a literal replacement for "That's what she said" in times when the full statement would be deemed crass and boorish, e.g. when in the presence of your grandmother.
"It was hard"
-"Pistachio"
by rtac April 29, 2008
 
2.
The Single most addicting snack ever

they look like little green penuts but DO NOT BE FOOLED!

they are really little green alien seeds sent to earth so that once one becomes addicted and eats enough they will explode and little alien babies shall run free...

Thee aliens plan on harvesting the seeds in 2012
FUCK MAN I FUCKING ADDICTED TO THOSE DAMN PISTACHIOS!
by Troya! October 19, 2008
 
3.
A delicious nut snack
"I LOVE PISTACHIOS" exclaimed Johannes
by ninjacow October 31, 2010
 
4.
A term used to describe the female genetalia, derived from the vaginal resemlance of it's shell.
Diane: You should find yourself a nice girlfriend Jack.
Jack: Ooh, not for me thanks. I'm not a fan of the pistachio.
by Mr G-Man November 30, 2011
 
5.
An Ugly Bitch
Dude this girl in my 3rd Period, Devon Gelista, is such a Pistachio
by Grunt-Ahuah Bros. March 21, 2011
 
6.
A young white rapper who raps about having sex with moms.
Have you heard the new Pistachio mixtape?

Yeah. I don't think I heard one song where he doesn't talking about fucking someone's mom.
by Uncle Scott August 10, 2010