Sam and Cat make a bet with the obnoxious Jepson. They have to prove that the word "lumpatious" exists and can be found in the dictionary. If they win, Jepson has to wear a bikini in public, but if they lose, then they have to come to the gym after his work out and drink his sweat'.

They frantically look through all the dictionaries, but can't find it anywhere. Then they go to Oxnard, who has the authority to put (new) words in the dictionary. The Word Keepers tell Sam and Cat that it can only be done if someone important/famous say the word.

Will they succeed or will they have to drink 'boy sweat'?

Meanwhile Sam is drinking a lot of milkshakes:

Cat: "Sam, you've already had nine milkshakes."
Sam: "Hey, tomorrow I'm going to have to drink a mugful of boy sweat from a teenage jerk. And after that, nothing's ever going to taste good again, so I'm sucking down number ten."