Bore da! Shw mae? Dal ati! Daliwch ati! Hwyl am nawr.
Translation: Good morning! How are you? Keep at it! Don't give up! Bye for now.
My Great-great grandfather came to the US as a boy in 1860. When I was a tot, he used to hold me on his lap and sing "Men of Harlech" in Welsh. Couldn't understand a word but I clapped and cheered just the same.