Onanism

[Monty]

Masturbation.

[Justin Bieber]

Colloquially it is a synonym, but technically the [Sin] of [Onan] for which it is named for is actually an instance of [coitus interruptus].

[Julian]

to wank,
to [tame] [the one eyed monster],
to make [the cyclops] cry,
mans favourite outlet,
a date with mrs palm and her five
lovely daugters,
toss yourself off,
etc etc

[Oralee]

from New Latin onanismus, from [Onan], son of [Judah] (Gen 38:9),
masturbation, [coitus interruptus], self-gratification.

[Sarah]

[the act] of [masturbating]

[Britney]

The [withdrawl] method of [birth control]
(removeing ones penis before [reaching] orgasm)
-not an effective method of birth control

[Luis Fok]

[Ejaculation] [outside] the [vagina].