masturbate \masturbate\ v. i. [imp. & p. p. {masturbated}; p.
pr. & vb. n. {masturbating}.]
To achieve sexual gratification by stimulating one's own
sexual organs, without the aid of a partner; -- typically to
the point of orgasm. -- {masturbator}, n.
Syn: wank, she-bop, jack off, jerk off, whack off, beat the
meat.
[WordNet 1.5]