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1.
A penis which can be used to accurately measure temperature.
"Is it cold today?"

"Let me go outside and check my penistat."
by ttoptommy July 03, 2012
 
2.
It's a tattoo on your penis.
Yo Jeff check out my penistat! It's a cross because i luv jezuz!
by Lolpokemanz543 March 14, 2010