Knobble

[Vania]

To destroy, damage, wreck, ruin, or generally f*** something up to the point that its unusable, or to f*** someone up or pop a cap in their ass. Can also be used to refer to doping a racehorse or an athlete.
Whats the betting someone tries to [knobble] Golden Thunder before tomorrows [big race]? (Racehorse/Doping)
I dont give a rats ass whether he apologized. I want you to go and knobble Sammy the Squealer. Give him a long [wet nap]. (Mafia/Gangster/destroying someone)

[Hina Muqadas]

A small knob or lump on something.

[Little_Girl]

Small [knob] aka [micropenis] or [prepubescent] dick.