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1.
The act of male masturbation.
I feel like knobbing-off
by Soke No-Last-Name June 20, 2010
 
2.
'Knobbing Off/To Knob off' - To get something done.
Natalie is quickly knobbing off her coffee before heading to work this morning as he is running late.
by Paul Webb Snr March 22, 2009