A dull, fairly quick explosive or percussive sound, as if made by a labouring engine.

A large gulp of drink.

“He drank his beer in three chugs.”

A homemade Cuban boat, built to carry emigrants to the USA, and often abandoned upon arrival.

To make dull explosive sounds.

To move or travel whilst making such sounds.

“We were chugging along a back road when the engine cut out.”

To 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!”