What is Underjawn?
Everything from the asshole to the front butt (male/female/shemale inclusive)
(see main entry for jawn)
Man, I could totally see her underjawn up her skirt!
or
My underjawn is all chafed and sweaty from riding my bike all day.
See genitals, cock, pussy, junk, perineum, taint
All you need for a faster workflow in one place.