The late 1800s - it was short for the common friendly insult "muttonhead."

respiratory failure, circulatory failure, you die asleep in your own puke muttonhead.

The offensive names for calling someone with autism is retard, dumdum,blockhead, dunce, dunderhead hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, poor fish, pudden-head, pudding head, stupe

Keith Lack has: Played Muttonhead in "Popful Mail" in 1991. Played Narrator in "Exile" in 1992. Played Master Mel de Alkirk in "Lunar: The Silver Star" in 1992. Played Fakhyle in "Exile 2: Wicked Phenomenon" in 1993. Played Narrator in "Vay" in 1994. Played Additional Voices in "Elemental Gearbolt" in 1997. Played Rafarga in "Magic Knight Rayearth" in 1997. Played Zohar Sandalphon in "Silhouette Mirage: Reprogrammed Hope" in 1998. Played Wolfgang in "Growlanser II: The Sense of Justice" in 2001.

addlehead. ahead. airhead. arrowhead. baldhead. bankhead. beachhead. behead. bighead. bitthead. blackhead. blockhead. bluehead. bonehead. bonnethead. bowhead. bridgehead. bufflehead. bulkhead. bullethead. bullhead. clubhead. crosshead. deadhead. dragonhead. drumhead. dunderhead. egghead. fathead. fiddlehead. figurehead. flathead. floodhead. forehead. fountainhead. godhead. hammerhead. hogshead. horsehead. hothead. knucklehead. letterhead. loggerhead. maidenhead. masthead. muttonhead. nailhead. overhead. pinhead. pithead. pothead. railhead. redhead. roundhead. saphead. shovelhead. showerhead. skinhead. sleepyhead. snakehead. spearhead. spreadhead. staghead. stairhead. stephead. subhead. swellhead. thickhead. trailhead. turtlehead. warhead. wellhead. whitehead.