Wrong.
When I was growing up in the East Midlands during 70s and early 80s trump was definitely used by many to describe flatulence. Definitely.
It was the go to word for it at my schools.
Then it seemed to die out towards the end of the 80s. No idea why, but at some point fart took over.

I have used it all my life and still use it to this day, even more so since that fat orange cunt was being overly cuntish on his first term.

Also.
https://english.stackexchange.com/questions/264355/in-what-english-speaking-communities-does-trump-refer-to-the-breaking-of-wind