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1.
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
 
2.
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