A portmanteau of the phrase, "Retarded as Herpes."
It means your thought, idea, or actions are dumb and/or stupid. You are retarded as herpes.
"I've got an idea, let's go hang out at the mall."
"No way, that's retardepes, and by extension, you are retardepes."
An eating competition at Fogo de Chao, where the first person to stop consuming meat has to pay for everyone else's meals.
"I got a free meal at Meatocalypse because Dave was the first to stop eating!!"