This episode was made for the crew and studio that originally worked on Dexter's Lab. It was never intended to be viewed by the regular audience. The reason this episode is so sought after is because it is about a rude version of Dexter and DeeDee who went around being rude and cursing. The cursing is all bleeped and it seems like it was always meant to be that way. As in, even when just the crew and studio watched it, the curse words were bleeped.
Anyway YAY!! I love Dexter's Lab and am so excited to be watching an episode I have never watched before! I'm having a ball watching this!