An Aslak is a little bird located in Norway. It's tweets sounds like "hoh hoh hoh". It is a very rare bird, so the chance of spotting one is very low. It is often said he is the Thor's bird (from "Asgard"). The exactly reason for that do no one knows. The bird is well known as Tor Aslak in Norway, because "Thor" is often written as "Tor" in norwegian.
<Cody>: I saw a rare bird today!
<Frank>: Oh! An Aslak?
<Cody>: Yes! A Tor Aslak! Unbelieveable!
<Frank>: Wow! Lucky you!