Definition of chugs:
(n) :
A large gulp of drink.
(v) :
(transitive, colloquial) To drink a large amount (especially of beer) in a single action/without breathing; to chugalug. Usually chanted at the person who is drinking.
(n) :
A dull, fairly quick explosive or percussive sound, as if made by a labouring engine.
(v) :
(intransitive) To make dull explosive sounds.
(v) :
(intransitive) To move or travel whilst making such sounds.
(v) :
(intransitive, by extension) To move or travel at a steady, although not especially fast, pace.