I was at a bar years ago with a friend playing pool. We weren't the greatest, but not the worst in the world. A very drunken gentleman wanted to play a team game with his buddy, so we decided to do that. Due to our inebriation, we went from seeming to really suck, to making some difficult shots. The drunken opponent then claimed that we were "sandbagging" them by pretending we sucked to turning into some sort of dive bar pool sharks. From then on, I use that term for all sorts of things, like when I'm playing Tetris and my opponent stacks up their side only to drop a bunch of tetrises (is that what it's called? Tetris???) in a row to just about any of the wall situation. "Stop sandbagging me bro!" as I wait in line at Target or whatever else. So if you ever are waiting in line to drop off your kids at school, and someone is driving really slow, feel free to pull up next to them and tell them to stop sandbagging you as you drive past. It's a great phrase, highly recommend 10/10