n. A hollow bulge in the crotch region of a girl's pants (the same area where a penis would be located on a man). As a girl walks or sits and crosses her legs, this area of the pants will bunch together in said bulge. A jeanus is typically caused by oversized or oddly fitted pants.
Grr! I can't get this part of my pants to lay flat! I have this hideously HUGE jeanus!
This pants are way to big. They give me a jeanus.
Now that I've lost weight, all my pants make me look like a hermaphrodite. I need new ones that don't give me a jeanus.
Guy 1: Dude, what's in Sarah's pants?
Guy 2: Nothing, that's just her jeanus.