a person unsuspecting of his/her unusual ways, whether it be aroogance of goofiness, usually of the male gender. A fun word to use as an insult (even when it doesn't apply to the definition), leaving the insultee confounded.
This is only my definition, you must look inside yourself to find your own meaning for the word fife.
Hey, look at that guy!
Wow, haha he's definetly a fife.