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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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Mar 1 Word of the Day
One who has a mania for music.
I am a melomaniac.
by Larstait November 14, 2003
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4
To swear upon the Christians all-father god.
Person 1: bruh you ain’t got 2k
Person 2: On god I got 2k
Person 1:bet...
via giphy
by Jeepers/ Figgle my nippers February 02, 2019
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5
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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