As usual, this is thoroughly documented to a perhaps ridiculous degree on the Transformers Wiki:
https://tfwiki.net/wiki/Transformation#Onomatopoeia
There is an official answer to this question. It’s Transformers; of course there is an official answer to this particular question. Actually, there are several. Jury’s out on which of these interpretations in particular have caused the franchise to be Ruined Forever, but surely at least one of them has.
The Transformers wiki is perfect.
Why the fuck did Hasbro release Transformers that don’t transform, though?
The Transformers wiki is perfect.
As perfect as the Homestar Runner Wiki (possible RIP)?
Had to pull out after an hour and a half expedition, what a trip
That is ridiculous and delightful.
SCHRJJRRREEEEPP
tsch ch ch ch tsch
Feels like no vowels
“Skrillex”
Hmmmmmmmmm
Does not matter if powerplant transformers or the one in your phone charger. Same Sound.
Best I can do is
“Metallic Koo koo ke koo koo”
Chichuchichuchich
It hasn’t changed since the OG 80s cartoon, right? 🤔
They don’t use it enough in the movies.
ki-kiri-ki
Fun fact: this means “peanuts” in Serbian
I’m sorry, but this belongs in Stupid Questions
