What is the meaning of the phrase "door ding"?
"I don’t want another parking space. I want my parking space. It’s perfect. It’s a corner spot, cutting the risk of DOOR-DINGS in half. It’s a mere 28 steps from the building entrance. The nearby tree provides shade on hot days and is also home to a delightful squirrel. Which is fortuitous because most squirrels are real jerks."

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"Door-Ding" - In this "Ding" actually the sound which comes the car door hits something like when we park the car in a narrow space and when we open the door sometimes (Actually most of the time :P) it hits the wall or the car parked adjacent to it..!!!

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Answer

When a car is parked next to your car, if the other person opens their door, it might hit your car. That is a door ding.

Most parking spaces (spots) have cars on both sides.

With a corner spot, you have a car on one side and nothing on the other side. So you are only half as likely to get a door ding.