Cena debuted his new signature manoeuvre at a non-televised live event in Shanghai last month during a Six Man Tag Team Match which saw him teaming up with Bobby Lashley and Finn Balor.
The daunting trio defeated Baron Corbin, Jinder Mahal and Elias after The Champ levelled The Drifter with the controversial finisher, which is basically just a backfist to the face.
Millions of fans around the world saw The Lightning Fist for the first time ever on TV during WWE Super Show-Down where the 16-time world champion and Lashley beat Kevin Owens and Elias in a Tag Team Match.
Cena appeared on Fallon’s show after the WWE overseas Pay-Per-View event to promote his new children’s book Elbow Grease and discuss his upcoming film Project X-traction, which will see him co-starring alongside Jackie Chan.
The ex-WWE Champion revealed that it was Chan who actually taught him the manoeuvre during his training at the JC Stunt Team International Training Centre in China.
The former World Heavyweight Champion told the TV host: “So I’m known for five moves of doom and I figured its was time to evolve, me having been in WWE 16 years now.
“So it’s time for a sixth move of doom, aka The Doomiest.”
Cena then ordered a reluctant Fallon to get on his feet and stand still in order to demonstrate the Lightning Fist in comedic fashion.
The former Saturday Night Live cast member tried to talk his way out of it but the WWE legend would have none of it.
Then The Leader of the Cenation acted like he delivered the backfist with full force to the presenter who pretended he was knocked out on the sofa.
WWE have confirmed that Cena’s next in-ring appearance will take place at WWE Crown Jewel on November 2 in Saudi Arabia.
The ex-US Champion will compete in the World Cup Tournament, which will determine the best in the world, against Kurt Angle, Jeff Hardy, Randy Orton as well as two more superstars from RAW and Smackdown.
The wrestler-turned-actor fuelled recent rumours suggesting he is about to retire during his last appearance in Australia as he said he has no idea what the future holds.
He said: “I have no idea what the future holds so I focus on the now.
“And right now I’m standing in front of 70,000 people saying the word ‘What’.”