A hole-in-one, also known as an "ace" is when you hit a shot from the tee box and make it in the hole. In the golf world, if you are playing with a group and make a hole-in-one, it is tradition to buy drinks for everyone in the group after the round. That is why a golfer who recently got a hole-in-one might say, "That hole-in-one drained my bank account!"
Great hole-in-one! Now you have to buy all of us drinks after the round!