This is a cool word.
It means “to move or climb quickly but with difficulty”.
The last part is what makes it cool.
Everyone can move fast but are you willing to do it against difficulty, hampered, being held back.
We see it sometimes as an extension of “Scatter” which is to go in a variety of ways all over the place but it’s not even close.
But when we Scramble, we’re fighting against the barriers to get somewhere and not giving up.