Karma for Bullies

Alright listen up, dummy. The joke is that the person is lucky because bullies can't push them around anymore. But the punchline is that the bullies will get what's coming to them when they end up in a wheelchair. So basically, it is saying that the bullies will one day be disabled like the person in the wheelchair, and that's their karma. You probably need someone to wipe for you, you big dumb-dumb!