A Philadelphia Eagles superfan spent part of his Monday night in a world of pain ... and it's all 'cause he took a huge bump to the chest from Jason Kelce at a parking lot party.
It all went down just prior to the Eagles' "Monday Night Football" game against the Atlanta Falcons at Lincoln Financial Field ... where Kelce was trying to rowdy up some fans at a tailgate outside of the stadium.
The former Birds offensive lineman hopped on the mic and gave an epic pump-up speech .