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This was the first result on Google
(lemmy.ml)
This is a most excellent place for technology news and articles.
"Hot tube" seems like a slang for some kind of drug device. Like a weird bong or something
It could also be a gross sex term for a dick. During sexy time someone could say to me "yeah give me that hot tube" and I would be immediately less interested in sex.
Sounds like something that you would find in a bargain-bin romance novel.
"His hot tube pulsated, throbbing with motion" or something like that.