knob job

Definition

Slang

  • noun an act of (male) masturbation or fellatio. A vulgarism in use since the 1960s, knob being one of the commonest terms for the penis in Britain and Australia. Although knob alone is rare in this sense in the USA, ‘knob job’ is commonly heard there.
http://www.dictionarycentral.com/definition/knob-job.html