Relatively self-explanatory - the mound of fat, found usually in women but sometimes in men - over the crotch in very obese people. Also spelled crotch fat.
My high school librarian had some serious crotchfat - I don't know how she can even fit in her pants.
1. Crotchwatcher
n.
Someone who cannot take their eyes off their own or another's no no square.
2. Crotchwatching
n. The process of watching one's own or another's crotch, usually for viewing Urban Dictionary definitions in class.
1. Bro, did you see that crotchwatcher? What a creep!
2. Dang, the teacher caught me crotchwatching.