Ren and Stimpy get in a fight and they become enemies and engage in several battle, including glove slapping and a giant robot fight(the robots look like Optimus Prime and Megatron in an homage to Transformers). At the end of the episode, they become friends again.
Then Seeu get back to the line
Stimpy: Your going to pay this!
Stimpy: Bite if you can!
Ren bite Stimpy's leg