Onnat means “on that”. Lost of people in the NJ/NY area use it on a daily basis and is usually used in text messages and conversations.
“Don’t worry about the bill, I gotchu onnat”
“I ain’t know you were onnat type of stuf bro”
by kingkb4 January 8, 2019
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IF YOU ONNAT, YOU JUST ONNAT, NO EXPLANATION NEEDED
“OH HE ONNATTTT?”
“YEA HE ONNAT IM NOT GON LIE
by jahmeeeeezy August 14, 2023
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The term coming from God Bless The Rundown meaning you don’t care and your on whatever with whoever, wherever.

If you say your onnat you better be about being onnat! Better be about that life.
“AYE JU ONNAT WIT HIM!”

Jeff: “Aye ju you onnat?”
Ju: “I’m onnat!”
by RUNDOWN OFFICIALS June 5, 2019
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A phrase used when to respond to something cool or something that you need to congratulate a guy for.
John: Dude I just fucked my bitch
Braydon: ayye berjee onnat
by chikendoodle16 October 20, 2020
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