The definition of someone who is a "Fucking Muffin" refers to someone so intolerably stupid that their brain resembles that of a muffin.
by Crabguysmellofcrab June 30, 2019

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"
Person2: "holy shit he must be the king of of them with that stupid ass face"
by Crabguysmellofcrab June 02, 2018
