Jon Stewart Mildly Threatens WWE Superstar ... 'You Messed With the Wrong Guy!' (VIDEO)

WWE superstar Seth Rollins has a HUGE problem ... there's "160 pounds of dynamite" ready to explode on his ass for talking smack about "The Daily Show" ... and that man is Jon Stewart.

Stewart just shot a video response to Rollins -- who went on "Raw" this week and said he should take over for Jon ... who was UNWATCHABLE as the host of the Comedy Central show.

Well, Stewart didn't take too kindly to the smack talk ... and came back HARD at Rollins with some threats of his own ... and it's EPIC!!!