Toxic-O's is a rat poison cereal seen in the episode Whose Phone Is Ringing?
In the episode Whose Phone Is Ringing? in a challenge called Invention Intervention, one joker had to try to get people to purchase an invention made by his "assistant". The assistant would sound like he is supporting the product but in actuality is trying to pull the rug from underneath the "inventor." Sal was the inventor and Q was the "assistant." The invention was Toxic-O's, a rat poison that looks like breakfast cereal. Sal had no way of defending this product and was forced to weakly claim that a kid that ate the Toxic-O's wasn't poisoned "as much." Nobody voted for the product, believing that Sal would get sued, thus giving Brian "Q" Quinn a Win and Sal Vulcano a Loss.