pp. While in a car in a crowded parking lot, waiting for, and possibly following, a person who is going to exit the lot and thus free up a parking spot.

Example Citations:
By the same token, don’t hover around waiting for shoppers heading to their cars. There’s a term for this: perching.
—Angel Streeter, “South Florida parking specialists offer holiday parking tips,” Sun-Sentinel, November 21, 2012

Perching” on someone who is about to exit a parking spot adds stress for both parties. Begin the parking search in a lot that is farther from the door.
—“5 Tips: Black Friday Car Safety from Ourisman Kia in Chantilly, Va.,” Today’s Auto News, November 23, 2011

Earliest Citation:
Now, instead of bees, think of humans parking. The parkers in the Montana lot who followed the “perching” strategy had evolved a very specific optimal strategy: They knew that near the top of the hour, as classes emptied, spots would become available, but it was better to search for the exiting driver than the spot.
—Tom Vanderbilt, Traffic, Knopf, July 29, 2008

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