From Norwegian duo Ylvis (not to be confused with Norwegian duo Kollektivet, who are, of course, far less serious), a late entry for the Song of the Summer:
For those looking for the answer, here it is, from Wikipedia:
bark, yelp, yiff, simper
Though of course if you’ve ever heard a real fox, you know what it really sounds like.
(Via Reddit and Gawker.)
Previously
The One Thing That’s Bigger About Norwegians