These two guys are on a crew cleaning up trees and other wooden debris from a highway. They're using a machine called a "wood chipper", which shreds the wood and spits it out as small wood chips. It's backbreaking work and one guy is really feeling it. But the other says he's feeling "chipper" which also means happy and energetic. Chip and Chipper can also be nicknames for men, such as the baseball player, Chipper Jones.