British vulgar slang for an act of fellatio. 'Knob' is British slang for penis, making the compound a direct, crude term following the same pattern as 'blow job' or 'hand job'. Firmly informal and sexual in register, widely understood in British English.
The stand-up comedian's opener about knob jobs set the tone for the rest of the show.
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(UK, slang, vulgar) An act of fellatio.
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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.
See all Regional & Other slang on Slangora.