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Short-hand for "on another note"
Grace: are u going to Chad's party on Friday?

Ben: nah too many frat boys. onan do u wanna go Chilli's on Sat?
by ittybittysmalls September 11, 2019
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2
Amazingly kind heart, you find yourself attracted to his smile. He will always be there to lend a helping hand
Call Onan, he knows everything.
by Chips505 December 10, 2016
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4
A dumbass, usually shit at life. You may also tell that he is horrible at soccer
"Yo, Onan why are you so bad at soccer?"
by ForniteSniper017 September 02, 2018
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