Jonah Hill and Channing Tatum made a bet that if "21 Jump Street" opened to higher than $35 million at the box office... Jonah Hill would have to kiss Channing Tatum's privates. We don't make this stuff up.

Does this mean Isabelle McNally's ex boyfriend will have to get up and close and personal to Channing Tatum's crown jewels?

In his new GQ cover story, Channing Tatum reveals a bet he and co-star Jonah Hill made if "21 Jump Street" soared at the box office.

"I will kiss your tip! I will kiss the tip of your d--k through your underwear if we make $35 million," an "intoxicated" Jonah Hill told Tatum, E! News reports.

"21 Jump Street" topped the box office and took in $36 million in its opening weekend.

Co-director Phil Lordpoints out that "there were many witnesses to this conversation," joking that "verbal contracts are binding in a court of law."

"I haven't made him do it yet," Tatum said. "For obvious reasons. That's a bad bet to lose-it's not too good to win, either. But definitely the shame of it would be enjoyable. It's my trump card, for sure. He tries not to bring it up at all costs. Unless he did something horrible to me, I don't know if I could ever cash it in. It would change our relationship forever."

According to Hill, "It's a lose-lose for both parties, I feel."

But Tatum said Hill isn't off the hook: "Maybe, on a drunk night when we're all being crazy and hopefully, knock on wood, 'Jump Street 2' works out and people love it, maybe out of the elation of that event in our lives I might call in the bet," the actor teases. "Or I might make him double or nothing."

While Tatum jokes that he would have to "clear it" with wife Jenna Dewan, Hill may also have to get permission from his new girlfriend!

Hill was spotted making out and exhibiting some major PDA with his new girlfriend Brooke Glazer in Los Angeles on May 11, Us Weekly reports.

The 30-year-old actor enjoyed the sunshine with his girlfriend and his dog at La Cienega Park. Jonah Hill and his girlfriend spent "over an hour making out," an eyewitness told Us Weekly.

Brooke Glazer, who is a nutritionist, even seductively licked "The Wolf of Wall Street" actor's sunglasses at one point! The actor recently split from girlfriend Isabelle McNally after dating for 8 months and it looks like he's quickly moving on.