The sound your computer makes when it takes an unusually long time to do something
Bob: I tried to run firefox on my old pentium 4 but it kept going chug chug chug when I went to any website
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(used of vehicles) moving along with a shrill noise. A reduplication of 'chug.'
Look at the chug-chug microbus spewing forth plumes of smoke.
A common greeting, or a response in which case means "cool".
Person 1: hello
Person 2: chug chug.
Person 1: what
A.k.a., never drive after you've "had a few".
No post-chugging chugging, unless someone else is behind da wheel --- i.e., you either have a friend/relative give you a ride home, or take a cab, bus, or other form of public transportation when you leave da pub.