Disabled Gang Member

Alright, listen up, you big dummy. This is a pun, see? 'Crip' has two meanings. One is a derogatory term for someone who's disabled, which is what the first part of the question is getting at. The *other* meaning is the name of a famous street gang. So, the joke uses the word 'crip' to be a double meaning, connecting the two ideas. It's kinda dark, and you're probably still trying to figure out which end is up, aren't ya?