An embarrassing mistake made while playing the viola.  More often than not, Fumbledumbles occur while playing the easiest part of the entire composition.
Teacher:  "Wait, wait, stop!!  Did you honestly just play an F sharp?!?"
Student: "Yes..."
Teacher: "But it's a C Major scale!!"
Together: "Oops!! Fumbledumble!!"
Student: "Yes..."
Teacher: "But it's a C Major scale!!"
Together: "Oops!! Fumbledumble!!"
by Wataru June 29, 2008
 Get the Fumbledumblemug.
Get the Fumbledumblemug.