Azzfucking is a variant on ass fucking. It refers to extremely rough anal sex. The term is often used when referring to non-consensual sex between two males. The term was coined by Jose Bonero.
Gilligan and Themoron frequently enjoyed consensual casual sex with each other. However one day, their relationship took a downward turn when Gilligan told Themoron he was too tired and had to go home and sleep, but Themoron went ahead and gave him a major azzfucking anyways.