Definition

To exaggerate, lie, or boast; to inflate one's accomplishments or attributes to appear more impressive or credible than reality.

Example Usage

Don't gas yourself—we all know you didn't actually win that tournament.

Origin

British slang derived from filling something with 'hot air' or gas; adopted and amplified through UK street culture, then spread globally via social media.

Fun Fact

The term can also be used as a compliment in some contexts (similar to 'hype'), where praising someone is 'gassing them up,' creating potential ambiguity depending on tone.

Source: Definition backfill (hailey)