Where you push the tip of your penis inside of your skin around it the skin around it closes over it. Usually done out of boredom or as a creative way to masturbate.
Joe: Dude, I was really bored yesterday.
Bob: How so?
Joe: I don't know, no one to hang out with. I was SO bored I started doing an innie penis.
Bob: You never were the best with friends Joe.
Joe: I know.
Bob: How so?
Joe: I don't know, no one to hang out with. I was SO bored I started doing an innie penis.
Bob: You never were the best with friends Joe.
Joe: I know.
by Mikiflyr February 07, 2014