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Booru-like anime site named after the Japanese word with the same name which means "masturbation"
Straight Guy: Hey man are you on onani.xyz?
Homosexual Guy: Nah! onani.gay works better.
onani by dirt 💖 May 7, 2022

Somn-Onanist 

Robert: Why were you sleeping on the couch

Roy: Dude, your a Somn-onanist, it was nasty

Robert: NO WAY

Roy: Control yourself next time you have a fucking sleepover
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
Josh: Man I'm so stressed.
Elucid: Go do some onani.
onani by EnlarqueIl EnGrotesque December 5, 2007
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