shoefiti
n. One or more pairs of shoes tied together by the laces and dangling from a powerline or other type of overhead wire.
Pronunciation
Etymology
Examples
2007
Kohler says four reasons typically given for shoefiti are fairly well-founded:

—A celebration for a rite of passage, such as a graduation.

—Hazing, such as throwing a freshman's shoes over the line.

—A memorial, to commemorate someone who died near the site.

—A simple prank.

The other two theories are more controversial:

—Shoes signify a place to buy drugs is nearby.

—They're a sign of gang-related activity, such as marking territory or commemorating a gang murder.
—A celebration for a rite of passage, “Laces wild,” Journal-World, March 05, 2007
2007
Look up around your city and what do you see?

A bird? A plane? No, it's a pair of mangy sneakers dangling from the powerlines.

Shoe-flinging, or shoefiti, has emerged as one of the more inexplicable forms of cultural expression in inner-city Melbourne.
—Lyndal Cairns, “Heels and toes and then a fling,” Northcote Leader, January 03, 2007
2005 (earliest)
Museum of Hoaxes has a fairly extensive thread on shoefiti under the subject, "Secret Powerline Codes." It incluces lots of comments from people around the world with their own theories on why the shoes are there.
—Ed Kohler, “Secret powerline codes: a couple cops weigh in,” Shoefiti.com, September 20, 2005
Notes
Note that Ed Kohler, the coiner of the word shoefiti, registered the shoefiti.com domain name on July 31, 2005. For more information than you'll probably want to know about the curious practice of shoe-flinging, see Wikipedia.
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