What is Kinwaller?
1.
Inbred.
When "Kin" folk be "wallerin" around (engaging in sexual activity resulting in an inbred pregnancy/birth)
Janie: Dave look at that mother fuckin' kinwaller.
Dave: What the fuck is a kinwaller?
Janie: You know on of those banjo-playin'-squeal-like-a-pig sister fuckers.
Dave: Ohhhh when you bone your sister and have a kid.
Janie: Yeah, pretty much.
See