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Colloquially it is a synonym, but technically the "Sin of Onan" for which it is named for is actually an instance of coitus interruptus.
"Onanism -- it's a hands-on job"

-Ghost, ENTER THE MATRIX
Onanism by Jay Jay Ron March 20, 2008
to wank,
to tame the one eyed monster,
to make the cyclops cry,
man's favourite outlet,
a date with mrs palm and her five
lovely daugters,
toss yourself off,
etc etc
"now on the subject of onanism...we dont want to find you hunched double on the sofa bed pumping your fist" (league of gentlemen)
onanism by pinkpill December 1, 2004
from New Latin onanismus, from Onan, son of Judah (Gen 38:9),
masturbation, coitus interruptus, self-gratification.
Jon can'g get any, so he practices onanism.
Onanism by El Cid June 21, 2003

Arboreal Onanism 

Prior to killing Martha Moxley, Michael Skakel masturbated in a nearby tree. He was convicted of 1 count of arboreal onanism.
Arboreal Onanism by TwatCop September 23, 2005
I think someone did onanism in my coffee again. That sure aint milk.

Well you would know scab mouth!
Onanism by Anonymous September 17, 2003
1.One who gives a speech with no meaning.
2.The ability to generate heat with no light.
Left wing voter: Wow! That was some speech; I almost wet my pants half way through it.
Right wing voter: What speech? That was the worst case of Obamism I've heard this year. All I heard was 40 minutes of buzzing in my ears.
Left wing voter: F*** you!
Right wing voter: F*** you back!
Obamism by H3adcas3 May 26, 2008