A weather event (rain or snow) with such a large amount of precipitation that your sack drags across the top of either flood waters or heavy snowfall when walking through it.
When in heavy snow, your ball bag will leave a nice little snail trail in between your footsteps.
Reinhold: You see the storm that we are supposed to get this weekend?
Peeb: Yeah man! Looks like it’s gonna be a sack dragger!
(Nathan) I ran over a groundhog his morning on my way to work
(Ricky) Why?
(Nathan) I was just draggin’ sack and didn’t feel like stopping so I just ran it over