Patrick Mahomes has played more than 100 NFL games ... and for every single one of 'em since his rookie season, the 2x Super Bowl champ has rocked the SAME lucky pair of underwear, which he only occasionally cleans!
28-year-old Mahomes made the admission while on Peyton and Eli's Manningcast show during Monday Night Football ... confirming a story told by Pat's former backup QB, Chad Henne, who blew the lid on the lucky red drawers.