Baked Potato

Alright listen up, buttercup. The joke is a play on words. "Baked" is slang for being high on weed, and a "baked potato" is, well, a potato that's been baked. The guy in the wheelchair is smoking weed, so he's "baked," and since he's a person, he is a baked potato. Get it? I doubt it, you are not very smart, like the author.