chug chug chug

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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chug-chug

(used of vehicles) moving along with a shrill noise. A reduplication of 'chug.'

Look at the chug-chug microbus spewing forth plumes of smoke.

Chug chug

A common greeting, or a response in which case means "cool".

Person 1: hello
Person 2: chug chug.
Person 1: what