I have been thinking for several days about a construction that I THOUGHT I had heard or seen in a class. Now I can find it nowhere. Please someone tell me if I'm dreaming or if there's something to this memory.

I seem to remember that there is a way to use "chun" to mean "about" "just" in the meaning of time. I want to say:

THOUGHT HOW I REMEMBER SEEING IT
I am/was just going outside/I am/was about to leave - Tá mé chun dul amach.

I'm just now buying/about to buy the cow. - Tá mé chun an bó a cheannach.

Can these be said this way, and if not, how are they said?

I'd like to know Ulster, Standard, and Connemara Irish for this.

Thanks
Féabar

Yes, that expression exists, though I haven’t heard it used very much in Ulster, at least. I’m not sure whether it’s alive and kicking in the other dialects, but I have a hunch it’s a bit of a bookish/written expression, more than a natural spoken way of phrasing it.

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Not a native speaker.

Always wait for at least three people to agree on a translation, especially if it’s for something permanent.

My translations are usually GU (Ulster Irish), unless CO (Standard Orthography) is requested.

Ulster : Tá mé le ghabháil amach (I think), tá mé ar tí ghabháil amach (I don't remember if this one is Ulster)
You wouldn't use "chun" nor "dul" in Ulster anyway.
"Dul" is only Munster (as a verbal noun) and standard.
I'm angry when I see Ulster people writing "ag dul"... while I know they don't use it in speech. As if "ag gabháil" weren't right enough to be written... Only Munster people use it (and Munster Irish is the least spoken dialect) and I wonder why they've chosen to put it in the standard...

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

I'd use ag dul for "going" out and ar tí for "about to" or "on the verge of". (generally speaking)

However, I would say something like Bhí mé chun é a cheannach etc.

Go raibh mile maith agaibh as an cuidiu a tabhairt dom!