The head-thing Norway and Denmark are doing is a replacement for hugging, because hugs look so awkward with their tiny bodies and giant heads.
Anyway, I was talking with a fellow Dane about the various mean names Scandinavians have given each other, and we realised that for some odd reason the Danes never came up with a name for their nemesis, the Swedes. We therefore came to the conclusion that “Swedes” was considered a sufficiently mean word in itself.
Sweden Norway Denmark
23rd February 2011