jacking off
gaydemon > dictionary > jacking off
jacking off | Of a male, engaged in masturbation, either by one's self or by a partner. The act of masturbation.
Meaning
Slang term for masturbation. Generally in reference to self masturbation, though can be applicable for someone else performing the action.
To achieve ejaculation by stimulation of the penis is the more clinical definition.
Related words
circle jerk, handjob, jerking off, massage, masturbation, wanker, whacking, wristing