The rapper made it clear to his pals that they could go on the vacation under one condition: They had to face their fears on the trip -- Mac included. And in the bonus scene, below, he upholds his end of the bargain -- by vowing to get his tummy tattooed.
"I've always been uncomfortable with my stomach, like, the tattoo part of it -- not the fat part about it," Mac says. "I just wanted to do it and stop b--ing about it."
Of course, the 22-year-old is no stranger to the tinted needle (he practically has the entire animal kingdom on his limbs), but there's something about the mid-section that makes him feel uneasy.
"It's a very painful place [for a tattoo]," he says. "[And] a lot goes on in my stomach -- digestion, turning solids into waste..."
So does Mac get inked? Check out the clip to find out, and let us know what your biggest fear is in the comments!