Sunny P is a local nickname for Sun Prairie. I guess it's a takeoff of the orange juice like drink, Sunny D.
A nickname for the city of Indianapolis, a reference to the circular shape of its city limits.
The technical definition is an adjective used to describe something as cheap or inferior. New Yorkers use it as a term encompassing all of the souvenirs sold in Times Square that tourists take home with them to remind them of their trip to New York City. (I mean, what else would you call a melamine ash tray shaped like a yellow taxi?) AKA kitsch. Individual items of schlock or kitsch are known as tchotchkes.
Slugging is a form of hitchhiking in DC that benefits both the hitchhiker and the driver. The driver can use the much faster HOV lane after taking on a passenger.