This is a functional movement of the tongue rather than an expressive signal. We do this so as not to waste food. The tongue curls so that any food fragments are carefully put back in the mouth to be eaten.
So what does this signal to our dumb friends, the humans? It means either that I like the food and want to make sure I get it all, down to the last crumb or smear. Or it means I was so hungry I didn't want to waste any, even of food that I was less keen on.
If humans look carefully at us, the fact that there is food being eating should make them able to distinguish between this kind of lip wiping and the swifter tongue flick, which expresses stress.
This video is also on Celia's Youtube channel in the playlist of cat signals - what is my cat saying?
https://www.youtube.com/watch?v=QxC12BbRB54&list=PLnwXtI1uuo884ABEOTorPYZNnIeTh04pV&index=26
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