How do you give a redneck a circumcision?
You kick his sister in the jaw.
Listen up, buttercup! So, like, a circumcision is when they chop off the extra skin on a dude's... you know. But instead of doing that to the redneck, they just clobber his sister in the face. Get it? It's funny 'cause it's violent and unexpected, kinda like your last attempt at parallel parking.