When you shit your pants and/or don't wipe well. This leads to your ass being caked in shit due to the lack of wiping.
Jason: What is that horrible smell
Brody: Ummmm..I think I had an accident
Jaosn: What the hell happened
Brody: Well, I don't like the toilet paper here so I have not been wiping properly.Here...take a look.
Jason: OMG...You have an ass caked in shit!!!!
Cave man 1: Why is Bob walking funny?
Cave man 2: Oh, he has diarrhea and he ran out of leaves so he had to use pinestraw to wipe, so he has Cave Ass.
Cave man 1: HAHAHA!
The hypothetical man (often a sinistercharacter who decided not to go to boot camp) that is doing your girlfriend/wife while you are on deployment overseas.
Ain't no use in goin home,
Jody's got your girl and gone.
Ain't no use in goin back,
Jody's got your Cadillac,
Ain't no use in feeling blue,
Jody's took your checkbook too.