Can anyone recognise this Welsh song??

[Trappedmumof3]

I learnt a song at primary school some 40 years ago. It was in Welsh and I find myself singing the tiny bit I remember over and over to myself but I have no idea what it is!! It's been bugging me for years - can anyone recognise it if I write it how sounds?!

Here goes:

Me see faack un yoi yuc fall
Un bew un all fuh fancy
Muh veen bik eye un .....

Any ideas??

Thanks! x

Men of Harlech?

Jac y do?

Sosban Fach?

OP it is Bugeilio’r Gwenith Gwyn!

https://m.youtube.com/watch?v=2pssD1KxjvI

The first line is

Mi oedd fachgen ifanc ffol
The previous poster has the right song.

About shepherding, such a lovely, evocative song. Used to sing it in school.

Oh my god, that's it!! Thank you so much for being able to get that from my attempt to write it out! I've tried to google it so many times but never succeeded!
I can rest easy now that I finally know what it is! 😂
That's! x

... and I've often wondered what it was about! I can finally look up the lyrics!

No idea why we learnt it in a primary school in Surrey but it's stayed with me all those years and I've always loved it!

Thanks x

perhaps you had a welsh teacher