An member of a high school or college marching band.
Pepe: Yo man....You know who I think is hot?
Gaylord: EWE! Dude, she's a fuckin FLUTE FRUIT!
Pepe: Ahhhhh nnooooo way...she cant be a band tard!
Gaylord: Yeah and she prolly has herpes too.....
When a male's penis shrinks to the point of almost going back inside the cavity from which it came. The balls act as a visual representation of the tortoise shell and the head of the penis as, you guessed it, the head of the turtle.
Man did you see Hank's wiener? It looked like a fuckin shy turtle!