Definition

A casual oath invoking God as a witness to one's truthfulness; equivalent to swearing on your life or honor. Used to emphasize sincerity or the absolute certainty of a claim.

Example Usage

On god, I saw him at the mall yesterday—I'm not making this up.

Origin

Hip-hop and African American slang, popularized in the 2010s-2020s

Fun Fact

Often shortened to just 'on God' as an interjection; has become so common it's used even in casual conversation unrelated to religious contexts

Source: Definition backfill (hailey)