Limbo Stick Is a form of slang used to define someone who is a tall, skinny idiot
Person1: "Hey person2 look at that fucking limbo stick over there"
Person2: "holy shit he must be the king of of them with that stupid ass face"
The definition of someone who is a "Fucking Muffin" refers to someone so intolerably stupid that their brain resembles that of a muffin.
You Fucking Muffin