I believe the technical term for that particular action would be called "tonguing." This is something I would never, ever....EVER do.
You're gross, Frank. 
Well, it's a good thing you didn't see it, because it was meant for only one person to see.
If other primitives saw it, I don't care, but I wanted one primitive in particular to see it.
If my understanding of the Italianate culture is correct, that was the
biggest insult one could deliver.
But at any rate, it's just a PG picture, I think--and no "action" in it, no way. It was clean.