Patrick Mahomes is SEVERELY underpaid despite signing a $500 million contract ... so says a Baltimore Ravens coach -- who claims the Chiefs star is actually worth over $1 BILLION!!!
Don "Wink" Martindale -- the Ravens' defensive coordinator -- told media members Friday if the Chiefs had paid Pat $1 bil he still wouldn't think that's enough for the star QB.
"I know he's got $450 million or whatever it is," Martindale said, "but they could have paid him a billion and I'd still think he's underpaid."
Martindale didn't appear to be just blowing smoke at his Monday night opponent either .