DONK, What does it stand for?

The term donk came from the impala symbol on any chevy impala from the year 1971 to 1976, because the symbol looked like a "donkey".

Hi-Risers are a type of highly customized automobile, typically an inexpensive American-built sedan modified by significantly increasing the ground clearance and adding large-diameter wheels with low-profile tires. Depending on the model and build year, autos customized in this manner can be labeled "donk," "box," or "bubble."

http://en.wikipedia.org/wiki/Hi-Riser_(automobile)