"Superpants" is a standard censor keyword on Route 50 suggested by Kat, used in place of various profanities by various members. Usually, "superpants" is used by members who dislike cursing in any way, shape, or form- and thus would not usually utter such profanities anyway.

It is a commonly known fact that Double Rainbows are the baddest superpants-ing rainbow one could ever see, as stated within the Double Rainbow Song's lyrics.