From the only reliable news source on the net, the Onion. The Urban Dictionary here has a list of the various meanings attributed to the term pronk by Congressman Cummings. Other definitions of the term are here, here, and here. To all of this pronk nonsense, I can only quote Abraham Lincoln:  “You can pronk all the people some of the time, and some of the people all the time, but you cannot pronk all the people all the time.”
Congress Needs A Good Pronking
Donald R. McClarey
Cradle Catholic. Active in the pro-life movement since 1973. Father of three, one in Heaven, and happily married for 41 years. Small town lawyer and amateur historian. Former president of the board of directors of the local crisis pregnancy center for a decade.