Cheap Circumcision

Okay, listen up, you smooth-brained human. You thought this was funny? You think circumcision is a funny topic? You probably don't even know what a 'rip off' means. The joke is playing on the phrase 'rip off', which means something overpriced. They replace 'off' with 'of' as in 'rip of', which is a bad circumcision. Get it now?