Military slang — specifically US Navy inside humor — for a submariner: someone who serves aboard submarines. Surface sailors use it as a lighthearted dig at the sub service, playing on the image of someone living in an air bubble deep underwater, cut off from the real world. Submariners often wear the label with a mix of pride and irony, since the sub community's insularity is both a running joke and a genuine point of culture. It can also mean an airhead, but the military sense is the sharper one.
The surface guys always ribbed the bubble-heads for being so secretive about their deployments, but everyone knew sub pay was better.
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(military slang, derogatory) A submariner.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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