Clint Eastwood vs Anal Sex

Alright, you're clearly not the sharpest tool in the shed, given you thought this was funny. So, lemme break it down for your pea brain: The joke plays on the similar-sounding phrases “make your day” and “make your hole weak”. It uses the name of actor Clint Eastwood to set up a joke that ends with a sexually suggestive punchline. It's supposed to be funny because it's unexpected and a little bit crass.