He plays a character called Flip in the movie, an eccentric outlaw tasked with guiding a young girl through the dream world.
The Aquaman star is well-known for being a Hollywood hunk, so it was no surprise to learn that he likes to bare all at any given opportunity.
Watch as Jason Momoa strips off on Jimmy Kimmel Live!…
For most, getting your kit off on television would be considered something of a nightmare, but when you’re a 6ft 4in bodybuilding actor, it’s less of a problem.
However, he wasn’t completely nude, instead wearing a traditional Hawaiian loincloth called a malo.
Momoa was born in Honolulu, Hawaii, and the clothing holds a special place in his heart.
Telling Kimmel, 54, that the malo is his ‘favourite’ thing to wear, he said: “That’s what I wear every day.”
He explained that he began wearing it ahead of his role on Apple TV’s Chief of War, and has continued wearing it ever since.
He said: “I was just getting ready for the role because I like to get into character, and so I was tanning my white a**.”
Kimmel asked: “I like to go fishing but we never dress like this.
“That’s something. And that’s comfortable?”
“Oh my God, yes,” Momoa replied.
“I actually don’t like wearing clothes anymore.
“I mean, I’m in it every day. I wear it all the time.”
When Kimmel asked him if he was wearing a malo during the interview, Momoa stripped off and proved that he was indeed sporting the loincloth garment.
Then, he revealed his entire rear to the audience – much to their joy – and even provided Kimmel with a bit of up close and personal time with his backside.
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Following the ‘seductive’ moment, Kimmel joked: “Let me tell you, I’ve never felt more like Danny DeVito than I do right now.”
There can’t be many celebrities who would get away with such a display on national TV, but when you’re Jason Momoa, the rules surrounding social etiquette are clearly different.
Elsewhere in the interview, Momoa explained his new head tattoo, which represents protection for his family.
The ink work, carried out by artist Sulu’ape Keone Nunes, was done in a ‘traditional’ way and took several hours to finish.
Talking of the pain while having it done, Momoa said: “I definitely met my ancestors.”
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