wibba wobba
A sub-species of the human race, moving around through their four small wheels. You know one is coming from their battle cries, chanting "wibba wobba wibba wobba" as they approach their unfortunate victims. Upon physical contact, a wibba wobba may disintegrate their victims if they choose to.
Fin: "A wibba wobba is coming"
Jimmy; "Shit!"
Wibba Wobba: "wibba wobba wibba wobba wibba wobba wibba wobba"
Jimmy; "Shit!"
Wibba Wobba: "wibba wobba wibba wobba wibba wobba wibba wobba"