Q: What did the cannibal do after he dumped his girlfriend?
A: He wiped his ass.
Alright, listen up, you chucklehead. The joke is that the cannibal "dumped" his girlfriend, which means he both broke up with her AND literally dumped her body somewhere. So, instead of feeling sad or whatever after a breakup, he just wiped his behind. You know, because you're so smart, I bet you wipe front to back.