Party Slog is the 1st episode of Secret Mountain Fort Awesome Season 2
Every time the Disgustoids have a party, Slog turns into Party Slog which annoys the bros, but when trouble strikes they need him to do so. When Slog becomes Party Slog, he has an incredibly large set of abs. Which the humans proclaimed as the "best set of abs in the world" Party Slog is actually very helpful. The Bros needed him when trouble strikes.