What do you call the worst joke ever?
Well, according to my mom, I am.
Alright listen up, dummy! This "joke" is all about self-deprecation. Basically, the person is sayin' their mom thinks they're a terrible joke. It's funny 'cause who expects their own mom to roast them like that? You probably think that's normal. It's a self-burn, see? Like when you try to cook and set off the smoke alarm. Pathetic!