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A pedant writes:

This is a mis-spelling of the more correct onanism.

Onan is a person described in the Bible (book of Genesis). He was the second son of Judah. His name is the origin for the sexual term onanism (synonym of masturbation), which many consider to be based on a misinterpretation as it more properly refers to spilling seed...

After his older brother Er died Onan was to marry Er's widow Tamar. According to the Bible, when he had sexual intercourse with his brother's wife he spilt his seed upon the ground (Genesis 38:7-9); the Bible says that he did this because (under the custom of levirate marriage) the child would not be considered his, but his late brother's. In response to this transgression, God killed Onan.
'Onerism, you ill educated peasant, surely you mean Onanism!'

Instead of 'Oh Fuck' one would use the following 'By Onan's withered Balls!'

Well, you could if you wanted ;-)
onerism by Nickdubya January 13, 2006
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Tossers! Shouldn't they be practising onerism in the privacy of their own rooms?
onerism by brittner September 18, 2003
Related Words

On Oneism 

Mastering the art of truly being On One with out causing any problems or drama in ones life. An enlightend state very many attempt and few achive.
Dave “Dude the E.O.O. has been sippin of the same handle of jb for the last week”
Steve “He is truly a master of On Oneism”
On Oneism by oneder April 30, 2005
New belief system - Est: October 2008 - All religions referenced, also taking science into account as one - Tree of Life is the Creation - Historical proof listed at oneism.org - Love replaces worship - witnesses of The Tree of Life testimony as introduced by Wayne Herschel.
Oneism, A belief system based on 18 years research and new witnesses coming forward - october 2008
Oneism by Senenmut January 17, 2009
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