Sherm, or "Slick", is a fictional character in the Hey Arnold! TV Series. Sherm is a butcher who's hair is slicked back, prompting Arnold and Gerald to give him the nickname "Slick". He and Dan "Porkpie" covertly prepare a surprise birthday party for their fellow butcher and friend Marty Green. However, Arnold and Gerald misinterpret their actions as malevolent, causing them to follow and film the butchers during their discussions and planning of the party. Sherm also claims to live in his car, though it's possible that this is just a figure of speech.