Matt Riddle claimed a NYC airport cop sexually assaulted him during a confrontation -- and while he seems to have taken it back, an investigation is now underway ... TMZ has learned.
The WWE wrestling star posted a shocking allegation Sunday, taking to IG to throw up a photo of a Port Authority police officer at JFK ... and attaching a scathing caption. He claims to have been touched inappropriately by this cop, but doesn't go into too much detail.
What he does say is that he told this officer "no," but alleges the man proceeded to do something inappropriate to him anyway.