yellow bird
n.— «For another, ward leaders have been known to take street money from candidates, promise support and then not deliver. There is a name for this, too. These ward leaders are called “yellow birds,” after the old airline commercial that touted vacation flights to Florida. They take your money and metaphorically (and sometimes literally) head south.» —“Cash and Carry (the City)” by Tom Ferrick Jr. in Philadelphia, Pennsylvania New York Times Apr. 22, 2008. (source: Double-Tongued Dictionary)
Further reading
Need a slang term that can replace just about any noun? Try chumpie. If you’re from Philadelphia, you may already know this handy placeholder word. And there’s Queens, Brooklyn, Staten Island, Manhattan, and … The Bronx — why do we add...
A Philadelphia, Pennsylvania, listener says when he was growing up, his family used the word schmutz as a verb. For example, when one parent reminded the other to apply sunscreen to the youngsters, they might say Make sure you schmutz the kids...