Wrestler "Stone Cold" Steve Austin asked Mike Tyson last month if he was man enough to take him on in the ring.
Tyson responded in Boston Thursday with a big, wet smooch.
The former heavyweight champion and the wrestler met in the ring on City Hall Plaza during a promotional workout for the World Wrestling Federation's WrestleMania on Sunday at FleetCenter.
Tyson, banned from boxing last July when he bit off a piece of Evander Holyfield's ear, was booed by the rowdy crowd at the workout.
"I hate Mike Tyson. I hope he gets killed," said accountant Jamie Chamberland.
"I'm waiting for something to happen, like he's going to flip out and hurt someone," said 24-year-old Mary Candler, waiting with a camera in the midst of a mostly male crowd.
The crowd hollered obscenities at Tyson, Austin and other wrestlers, and many held up signs and giant foam gloves showing an obscene gesture.
Tyson is supposed to play the "special enforcer" at the WWF championship match between champion Shawn Michaels and Austin, the WWF's most popular wrestler. But there has been speculation that the boxer would enter the ring and throw some punches.
At Thursday's promotion, Tyson joined Michaels and two other wrestlers giving Austin a beating, and finished it off with a long kiss on the forehead while Austin was held against the ropes.
Tyson -- who wore a brown jacket and slacks in contrast to the colorful or menacing costumes favored by the other wrestlers -- looked awkward trying to join the theatrics of professional wrestling as he lightly kicked Austin's legs.
Tyson, whose purses have topped $100 million in his last six fights, said he would be making a little more than $3.5 million for being involved in the WWF championship match -- a $34.95 pay-per-view event.