Definitions by F. Millmore

Marty McFlying 

To walk backwards haphazardly, usually resulting in an unwanted encounter or physical altercation. Derives from Marty McFly from "Back to the future", as this action usually precedes a very bad event.

That kid over there was Marty McFlying all over the store and knocked down the tower of sodas.

Marty McFlying by F. Millmore April 23, 2010