RatDubbbz is a character that appears in WORLDS BIGGEST RAT??!! (DISGUSTING), a video that was uploaded on the TooDamnFilthy channel, on June 28th, 2016... He is just iDubbbz painted with a bit of silver wearing nothing but a pair of boxers and some Minnie Mouse ears.
RatDubbbz has appeared in one episode. In this episode, he, Rat Frank, and Jack flip a coin and whoever chose the wrong side of the coin has to put their finger in a mouse trap, which later escalates to a rat trap.