Hand gesture used in sketchy or shady situations often performed while announcing "shady tree" or any accusation of sketchiness. To perform the Shady Tree, the left hand is made into a fist, thumb-side up, and the right hand is held open, palm down. The palm of the right hand should be placed atop the left fist and the outstretched fingers of the right hand wiggled in a manner similar to that in jazz hands.
A: ...and then he asked her to go behind the shed.
B: *shady tree* Sketchy.
A: I know, right?
A cool music fan. Defined as one who goes to concerts all the time, whereupon he or she looks cool and dances stupid. Interesting as the word "cool" modifies "fan," while it is not obliged to modify "music."
Possible reaction upon meeting a cmf:
Omg, a concert a night? You are a total cmf. I love you forever.