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On God is a phrase which is a way of saying that someone is telling the truth. Similar to another phrase such as "I swear to God." Other common uses are "On my mom," "On my grandma," "On my grandpa," "On gang," etc...
Person 1: I whipped out of that parking lot so fast, spinning the wheel, I 'bout flipped the damn car over. Then the police started following me, and I had to run away.

Person 2: Really?

Person 1: On God, bruh."
by piercethegreenbridesveil January 07, 2017
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When your serious, and no one believes you
Julio: Whatup Folk...that girls booty is thick.
Kyle: Yeah right nigga she aint got shit on god she dont
by GeT'Mo.ChEdDa December 18, 2008
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A phrase used to describe something so honest you're swearing upon God's name.

I swear on God = On God
Guy: I swear people ask themselves questions on ask.fm
Girl: On God.
by HollabackGirl July 22, 2013
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a common exclamatory when you boolin on a fella. Shortened from β€œI swear on gods name”, it’s believed the popular trend was started by 21 savage.
(whilst playing games in discord)
NSA: on god this guy is bad
MCP: fuck yea we booled on the nigga
NSA: This dude can lick my timbs
by Shialaebouf February 09, 2018
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random ass nigga: You a pussy ass bitch
You: On god, I'm gunna beat your ass
by SuperTigerYT July 10, 2018
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