So mis-timing is now considered sand bagging?
When's the last time you saw that clip because if Tensai was "Sand Bagging" Ryback, he wouldn't have made the effort to jump 2 seconds before Ryback tried picking him up. A missed cue between the two for sure, but in no way was The Giant/Stevie Ray, Scott Steiner/Bagwell, or Regal/Goldberg.
Here's a board (check the spoiler button) that might help you understand the word a little better as "sand bagging" is closer to being related to a "shoot" than what it seems you are thinking. Scroll through the pages and see if it gives you a better idea of what "sand bagging" really is versus miss timed movements in the ring. Fair Warning - If you are against seeing a few of the more violent incidents, I suggest you read the posts before watching the clips (The Mike Levy and Mass Transit incidents are pretty graphic).