Fluffy Puff Translucent Dessert Related Substance
From Homestar Runner Wiki
Homestar Runner was given a lifetime supply of Fluffy Puff Translucent Dessert Related Substance as a payment for the Fluffy Puff commercials he had done in the past. He filled the entire Swimming Pool with it when it was too cold to swim. Strong Bad, Homestar, and The Poopsmith ended up getting stuck in it. Eventually, The King of Town saved them by drinking all of it up. Its mascot is a red gelatin variation of Marshie called Gel-arshie.
It is mainly just a few paper packets labeled "Fluffy Puff Translucent Dessert Related Substance", each one filled with red powder. When mixed with water, this powder expands and becomes solid. The dessert made a reappearance in Homestar Ruiner, where it was referred to as Fluffy Puff Jela-Ton. Coach Z mails some to Homestar as a consolation prize for losing the Tri-Annual Race to the End of The Race, but Strong Bad uses the substance to help cheat in the race.
The dessert also appeared in 8-Bit Is Enough, in which it is referred to by both of its previously given names.