He was really sweet-talking her.

Danke!

I found this in my Langenscheidt dictionary:
Süßholz raspeln F turn on the old charm

For the sake of completeness, the entries to "Süßholzraspler": suessholzraspler

Süssholz raspeln = Turning on his (her) charm.

I've never heard of that ...ever!

The Blarney Stone is a block of limestone built into the battlements of Blarney Castle, Blarney about 8 km from Cork, Ireland. According to legend, kissing the stone endows the kisser with the gift of gab (great eloquence or skill at flattery). The stone was set into a tower of the castle in 1446. The castle is a popular tourist site in Ireland, attracting visitors from all over the world to kiss the Stone and tour the castle and its charming gardens.

The word blarney has come to mean clever, flattering, or coaxing talk.

Maybe it´s more common in Ireland then.

Ah, I've seen that on TV.. It's the one where they lie on their backs and lean backwards to kiss the mouldy stone. I don't know if you get the gift of the gab after that though, more likely a nasty bout of Lippenherpes.