Short for "On jah?"
Elijah: I just found the unreleased xxxtentaction album

Brandon: yo Onj
by Elijah_who? March 25, 2019
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An onj is a girl who is always making dark jokes, loves country tv shows and is at least 50-78. You are a girl who did the tiktok challenge where you remove the first and last letter of your name. Congrats, now stop wasting your time.
Boy: Great, its my onj.
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Dude!
What??
Lil Nas X is gay!!
ONJ???
by ericnutella July 3, 2019
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Person 1: ouu he a thicc boyy person 2:onj😼
by @916_elenaa June 22, 2023
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ONJ is a concept. She’s smelly.
-Who is ONJ?
-I think you mean WHAT is ONJ.
by massivewanker101 July 21, 2019
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damn this is some good ice cream.

onjs bro, it’s so good!
by hayls luv January 20, 2021
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