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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"

by Jay Jay Ron March 20, 2008
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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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)
by pinkpill December 01, 2004
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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.
by El Cid June 21, 2003
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I think someone did onanism in my coffee again. That sure aint milk.

Well you would know scab mouth!
by Anonymous September 17, 2003
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that boy is so onanistical
he is havin a blast with that onanism
My pito is ready for its ony time
by mexican't101 February 25, 2009
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The withdrawl method of birth control

(removeing ones penis before reaching orgasm)

-not an effective method of birth control
Lets do onanism tonight hunny
by dude August 24, 2003
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