Gillie Da Kid Barks at Law Agent Accusing Him of Drug Use

8:12 AM PT -- We're told the agent was no U.S. Marshal but rather a law enforcement officer.

Gillie Da Kid's travel plans were soured a bit Tuesday ... after the Million Dollaz Game podcaster was pressed by a patrolling officer claiming he smelled of marijuana at the airport.

Gille and co-host Wallo had previously been enjoying their downtime at Dallas/Fort Worth with jokes ... but the fun would be short-lived once they began boarding their plane.

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