deaf and dumb noun the buttocks, the backside, the anus UK Rhyming slang for BUM.
[S]omeone offering anything that is unwanted may be told to “Shove it up your deaf and dumb”. Or it may be used in glowing terms of reference, e.g., “She’s got a lovely little deaf and dumb.” — Ray Puxley, CockneyRabbit, 1992