Flogging comes from simply spelling golf backwards, and if you are flogging you are pretty much playing backwards as well.

"With the way you're playing today, you might as well just aim for the tee box."

- My dad (thanks, jerk) =)

For golfers, a flog is an extremely terrible shot. Some of the funniest looking, and worst shots occur when the shot is hit way too fat, which means that way too much earth was hit, or if the shot is topped.