You asked:

what does fumble mean

The term 'fumble' has a few uses: as a verb, 1. feel about uncertainly or blindly; 2. make one's way clumsily or blindly; 3. handle clumsily; 4. make a mess of, destroy or ruin; 5. drop or juggle or fail to play cleanly a grounder; and as a noun, 1. (sports) dropping the ball.