The message painted on a car window in the parking lot said, "Honk!! Just Married-Venmo @. . . " followed by a woman's name.
Venmo is a popular app you can put on your phone to securely send and receive money from friends and family. It is widely used among younger people and handy for splitting a dinner tab, sharing the cost of a gift, and apparently for asking strangers to help foot the bill for your wedding.
Miss Manners and Emily Post never covered Venmo etiquette. If they had, I imagine their response would have been to put "please" at the end of the request plastered on your car window. Good manners are timeless.