bubble head
n.— «Since I’ve never talked to a bubble head, or had much knowledge (post WWII) on submarine operations I really can’t comment from that side of the coin. However, being on an ASW platform in the past, I can comment from that side.» —“Re: Are Aircraft Carriers Obsolete?” Usenet: sci.military Jan. 24, 1989. (source: Double-Tongued Dictionary)
Further reading
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Mav in Madison, Wisconsin, has heard content creators on platforms like YouTube and Twitch address their viewers collectively with the word chat, as in Chat, is this real? and Do you see this, chat? She’s heard some people describe chat used...