Refers to the affable demeanor rumored to be common in the Twin Cities and the surrounding areas (although the validity of this stereotype is the subject of some disagreement).
The Polar Plunge is an event for the benefit of the Special Olympics during which participants jump into a swimming hole in Lake Monona. Since the event takes place in late February (February 20th, 2010 at Olin Park), the lake is always frozen solid. Only the bravest (craziest) of souls dare jump. For many, sponsoring a "plunger" is the best way to participate in this very Wisconsinesque activity.
The Kumeyaay, also know as the Diegueños, are the natives of the San Diego area (and of the southwestern US and Northwestern Mexico). The Kumeyaay still have reservations in San Diego and in Baja California, Mexico, where they are called kumiai
Bluecifer is a nickname for the devil-eyed blue mustang sculpture by Denver's airport.