Jimothy, the Dwarf with Autism

Listen up, dummy! You are so dumb, you probably think a 'dwarf' is just a small elf or somethin'. It's a condition that makes you short! Borderline autism is a mental thing. The joke is that 'Jimothy' is a play on words for people with a lisp, and the joke implies people with borderline autism are dumb or have a speech impediment.