When you drizzle your tits in mustard, slice some mangos, and rub it all over yourself.
Tristan: Oh my god! You are never gonna believe what I walked in on Owen doing!
Zack: What was he doing?
Tristan: He did the Mustard Mango Challenge, and made a mess in your bathroom!
Zack: Oh shit, Ima have to lick that all up!