From Homestar Runner Wiki
Quesos are the form of currency that Strong Badia uses. They appear to be the money from "Maps & Minions" with Strong Bad's image drawn on them, with "Strong Badia", "i'm so great", and "Come on Guys" written around the edges. Quesos were first used in the SBCG4AP episode Strong Badia the Free. Quesos look strikingly similar to Monopoly Money. According to Strong Bad, Quesos are "the most moist and juicy of all barely legal tender". In Dangeresque 3: The Criminal Projective, one of the thing's Homestar's character demands is a million dollars in Quesos. "Quesos" is a pun on pesos, Mexican currency, although in Spanish, "quesos" actually means cheeses.