I may agree with some of your comment, but “trump” has definitely meant fart (at least in some parts of the UK) from at least the mid 1980s until the present day. It’s seemingly still used by young people as well, though not as commonly as it was when I was younger (though I did hear a “who’s fucking trumped, it fucking stinks” on the bus last week).

We all laughed at Donald Trump when we first heard his name in the 1990s, though most people didn’t believe he was real (and it was hard to check such things, pre-internet). We certainly didn’t believe he had a wife called something like “I want to trump”.

Though we did play Top Trumps, we also definitely laughed at its name, and amongst our group of friends, introduced flatulence-based punishments for the loser.

Here’s it in some dictionaries: “(intransitive) British slang to expel intestinal gas through the anus” Collins English Dictionary

“to release gas from the bowels through the bottom”
Cambridge English Dictionary

“slang or colloquial. The act of breaking wind audibly”
Oxford English Dictionary

I don’t know why this matters to me so much :D

Maybe I’m just scared that our language is dying.