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Pistachios are like women. The degree to which the shell is open represents the degree of difficulty to get into a girls pants. Also has a corrleation to how satisfying the pistachio/girl is once you get it. If the shell is really wide open, it is easy to get into and less rewarding. If the shell is shut, it takes a lot of work to get into and is very rewarding.
"Man that girl last night had no shell, super easy! I miss the challenge."

"What do you mean by no shell?"
"Pistachio Theory man."

"Dude this girl is a sealed shell! Way too hard to crack!"
"Great use of Pistachio Theory."
by Pistachioman February 21, 2014
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