Player from Michigan here. We have a bit of a different way to do score cancelling and end game. Holes are worth 1, 3, 5.
Team A throws all 3 washers, then Team B throws all three washers. Any washer from Team B that lands in a cup on top of Team A scores the amount of the cup, and cancels all of Team B's washers that are in that cup. For example, A throws 2 washers in the 3 cup and one miss, and sits at 6 points. Team B throws a 1 and a 3. Team B's 3 cancels out both of Team A's washers and scores 3 points for B, so the score after this round would be 4-0 in favor of Team B.
Another interesting twist is if a washer gets knocked in by the opposing team. If a leaning washer gets knocked in by the other team, the washer(s) on top scores. For instance, Team A throws first and hits 2 in the 1 cup, and a washer near the cup. Team B misses the first two, then throws and hits the 1 cup, but Team A's washer falls in on top of it. The two washers from Team A already in the one cup are cancelled by Team B's, then the top washer from Team A scores the point. The score of this round would be Team A 1-0.
For the end game, if a team scores 21 or goes over, all remaining washers are given to the other player. All of the scored points are subtracted from the current score when a team goes over 21. For instance, Team A has 15 points and throws a 3 followed by a 5. If those are not cancelled out by the opposing team, Team A would go back to a score of 7. However, scores are not final until all washers from that round are thrown. Consider that the score was 15-16. After hitting a 3 and a 5 and going over (sitting at a current score of 7-16), Team A gives its one remaining washer to Team B. Team B then hits a 5. They now have 21, but Team A's 5 that caused them to go over is cancelled out, bringing the score to 18-21. Team A then gets whatever washers are remaining. If they score a 3, the game will go to overtime. If they score a 5, it would bring them backwards again, but Team B would have any remaining washers to attempt to get a 5 again.
Overtime rules are that each player throws 3 washers, there is no cancelling, and highest score wins. After the first player from one side throws their 3 washers, any washers that landed on the board are removed so that each player faces an open board.
If one player throws washers in each of the 1, 3, and 5 cups, it is a "Trifecta"
If one player throws all 3 washers in the same cup, it is a "Cheeseburger"
(a cheeseburger in the 3 cup and a trifecta are both worth 9 points, but it only takes the second player one washer to cover an entire cheeseburger.)
Anybody else have their own vocabulary for scoring plays?