Definition

An emphatic assertion of truthfulness, used to stress that what you're saying is genuine and honest. Originated in African American Vernacular English and became mainstream internet slang to reinforce sincerity.

Example Usage

That movie was so bad, no lie—I fell asleep halfway through.

Origin

African American Vernacular English, popularized online in the 2010s

Fun Fact

Often used as a standalone interjection rather than a full sentence, similar to 'for real?' or 'facts'

Source: Definition backfill (hailey)