1. to watch porn, to masturbate (usually simultaneously)
2. to give head to a guy
Originates in high school sex-ed classes where studying is laughable and sounds slightly dirty.
1. John: "I was watching the Kim Kardashian sex tape last night, and it's pretty hot.
Jim: "Dude you study for the penis test with that like every night"
2. Jane: "OMG I had the most AMAZING time with Jake last night! We saw Old Dogs and it was SO funny!"
Janet: "Please that movie sucked you studied for the penis test didn't you?"
Jane "OK maybe just little..."
A combination of the words penis and attitude, it is a lifestyle choice centered around compensating for a small penis.
Girl: See that 50 years balding white guy driving that spotless F450? That’s some serious penisitude right there.
Guy: *shouting* SORRY ABOUT YOUR PENIS, BRO!
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi