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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
Related Words
The nauseating and cellulite ridden folds of skin and fat quivering over the edges of a woman's inhumanly tight pants. Seperate, but often confused with love handles.
Some of the girls aren't fat, but often have onkers because they are wearing really tight pants.
onkers by Richard Decker April 21, 2006
Tossers! Shouldn't they be practising onerism in the privacy of their own rooms?
onerism by brittner September 18, 2003
Guy 1: Bro Tenrii is cool.
Guy 2: Literal idiot, Onerii is 20x cooler.
Guy 1: Oh h*ck I forgot about Onerii, yeah he is 20x cooler in every way.
Onerii by AAAAAAAAAAAAAAE January 16, 2021
an amazing person! they are the best fischl main in the world.
oh wow, did you see how great oukeria’s damage is?
oukeria by oukeira April 30, 2021
A very focused person who is always firm about his decisions. Apart from this he's really funny and has a strong humour. He cares about his closest people but is different when his lines are crossed.
Wow! Onserio amazing
onserio by bonaa August 7, 2022