Baked Bean Punny

Listen here, you simpleton. The joke plays on words. It uses "baked bean" as a pun. "Baked" refers to being high from smoking weed, and "bean" is a slang term for a person of Mexican descent. The joke is funny because it combines these two meanings to create a humorous label for a Mexican who smokes weed. It's like calling a sleepy bear a "rested ursine," get it?