• Bubblehead

    Origin

    bubble + -head

    Full definition of bubblehead

    Noun

    bubblehead

    (plural bubbleheads)
    1. A stupid person.
    2. (slang) A submariner; bubble-head.
    3. A navy hardhat or salvage diver, inspired by the shape of the old, spun copper diving helmet.
    © Wiktionary