A muffrie is slightly worse than a douche bag. You use such a term when you want to call someone, who is in the room, a douche bag. But don't throw this term around like it means nothing; calling someone a muffrie is a great way to insult them to their face, without them knowing what you mean. To use the word on anyone that slightly annoys you greatly diminishes the word's insult value. So make sure you and your friends seriously despise this person and would like to kick their ass before you call them a muffrie.

When you eat dirt for the first time and leave your family to build a shack in the woods