A person who is very dirty, smelly, or greasy. Possibly an un-holy combination of the 3.
Basically Someone who is a stranger to showers. Basically it seems as if they were born from an asshole rather than a pussy and when they popped out they landed in a large steaming pile of horse shit and never washed it off.
Dude do you smell Sean's stank ass coming? Ugh he's such a fucking scrod butt.
Bro I was fingering this bitch and when I pulled my finger out I thought she was super wet but no dude, it was grease bro, I thought I fingered a tub of Crisco, thats the last time I mess with a scrod butt.