Jon Moxley's AEW return was off to a piping-hot start on Wednesday -- 'cause the wrestling star clapped back at a heckler while in the ring ... telling the guy to "go f*** yourself."
ON LIVE TV!!!
Moxley made his highly-anticipated comeback to the squared circle on "Dynamite" after stepping away to address his drug addiction ... and one guy clearly took issue with his appearance.
As Jon began speaking ... a fan is heard shouting something like "get the trash out the ring" and booing during Moxley's speech.