Definitions from Wiktionary (Red room)

▸ noun:  (Internet) According to an urban legend, a room where people are tortured and murdered for an audience of viewers via the Dark Web, the viewers sometimes voting or bidding on the form of torture to be performed.
▸ noun:  Used other than figuratively or idiomatically: see red, room.
▸ noun:  A torture chamber.
▸ noun:  (Internet) A supposed kind of online forum where livestreams or videos of torture and murder can be viewed over the dark web.
▸ noun:  A room primarily used for sex, often a sex dungeon or a room used by a prostitute.
▸ noun:  A VIP room.
▸ noun:  (politics) The legislative chamber of the upper house in a bicameral parliament.

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From "If I Know You" by Nerina Pallot: Madonna's in the bathroom Madonna's in the redroom

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