Patrick Mahomes is going to enjoy a cold one with a side of foot sweat if the Chiefs win the Super Bowl on Sunday ... 'cause the K.C. star said Monday he'll chug a beer right outta Cooper Manning's boot if they get the dub over the Eagles!!!
The quarterback made the promise to the oldest Manning brother during a fun interview at Super Bowl week's opening night -- after Cooper had asked him a series of questions about cowboy boots.
Eventually, Mahomes said as long as Cooper joined him in the beer guzzling, he'd drink one down out of the footwear no problem.