2.verbTo move or travel whilst making such sounds.
"We were chugging along a back road when the engine cut out."
3.verbTo drink a large amount (especially of beer) in a single action/without breathing; to chugalug. People usually chant this at the person who is drinking.
"Chug! Chug! Chug!"
4.verbTo solicit charitable donations on the street, particularly in a persistent manner.