What is a ground loop?

Cub Driver wrote:
I'm told that it is also standard procedure to **** on your tires to
freeze them to the ice, chocks not being very useful in that
circumstance. I haven;t tried this myself; first I was too timid, then
the bay didn't freeze, and most recently I couldn't get out of Hampton
for nearly three months because of snow, ice, wind, and mud.

Hmmm... brings a whole new meaning to the saying "old pilots and bold
pilots". ;-)