A backwoods brush ape is a sister fucking, one tooth Arkansashillbilly. Or like one of the hillbillies from the movie deliverence.
Orlando - "hey man do you want to go make that fat man squeal like a pig?"
Manuel - "why not have incest sex first?"
Jake - "you guys are a bunch of BACKWOODS BRUSH APES"
When in N.E. Pa, passing any random open field could reveal a man wearing fishing boots with a sheep held snuggly to his groin area. This is an example of a backwoodssheepfucker.