The movie hunk, who was once a male stripper in Florida, had to bundle his pal into a car and dress him like a child after Hill announced he was hitting a beach restaurant in his damp underwear.
Tatum says, "We decided to go and jump into the ocean, naked... It was nighttime, thank God.
"After that, (and) this is where Jonah decides to wild out, there's a Jerry's Deli, like, right on the corner and he decides that he wants to go in and all he's got is a T-shirt and his underwear on.
"I stopped him and I drug (sic) him into the car and now he's nicknamed Baby Jonah because I had to dress him like a mom. I was like, 'No, no, bad Jonah, no... Butt up... OK, we can go in now!'"
The two stars became best friends while shooting the comedy, which opened in America on Friday (16Mar12), and Tatum admits his pal was easy to prank - especially when he was asleep.
During an appearance on U.S. late night show Jimmy Kimmel Live! on Thursday (15Mar12), The Vow star showed photos of him rubbing his bare butt on Hill's face while the Moneyball actor slept on a flight.
He said, "When there's no women around, you know how guys do. If there's no supervision, it just can go way off the railings real fast."