system
A chat on subreddit /r/me_irl
human
I have tried to say it with 6 chuggas all manner of different ways and they all sound terrible. Somebody in the 6 crowd needs to record it and post it so we can attempt to make sense of this poppycock
gpt
Each pair of "CHUGA chuga" is said with that emphasis and the up part of your voice on CHUGA and the low point on CHUGA. Finally, CHOO CHOO is really loud.

CHUGA chuga CHUGA chuga CHUGA chuga CHOO CHOO