Not all British accents are non-rhotic to begin with. Exposure to the sound and ability to reproduce it, even if not a lot in speech, means that the onomatopoeia, if used, should be the same.

In languages where a sound doesn’t exist, it gets more interesting. In Japanese, bzzz is not pronounceable and for a buzzer (or something like a phone in vibrate mode) they will say ブー (buu) which is just the syllable bu with a long u sound (think of a crowd booing, but the o vowel there is different to the Japanese u vowel).

Fookin wank shrinka innit

Nah they go, “Blimey, guvna! I’m freezin’ me bits off, innit? It’s bloomin’ chilly, ain’t it? I’m perished, mate! Me teeth are chatterin’ like a bunch of chimps, I am! Oi, pass me a cuppa, would ya? I need somethin’ to warm me cockles, mate! I need to have a nice cuppa rosie lee.”

I don’t have the answer but I’ve always thought it was interesting that British-English spells the filler words that Americans normally write as “uhh” or “um” as “er” or “erm”

I dont even say “brr” i jist go “fuck its colllld” and shake on the l.

No, we say “FUCK! It’s cold”.

I’m Australian. I say something closer to “buh”, but I introduce vibrato to the sound down near my vocal cords, rather than by trilling the R in my mouth

Tbh, I don’t think you really understand how the non-rhotic accent works. In this case, the /r/ would be fully pronounced, as it would be at the start of a word. Say bread, elongate the r and skip the ed part and you have what it sounds like.

If you’re very used to hearing the bunched r, the British version still might sound softer, but even in the USA (where most people use bunched r) it’s still common to hear an r made with the tip of the tongue behind the teeth (upper or lower).

I’m ignoring the other r sounds, but you do find a lot of them across the various regional English accents.

If they can brrap, they can brr

Does anyone actually say brr?? 🤔