Back to --OutpostMir-- teaches you some Russian!
Pronunciation of Amirikanski depends on the sex of the person you are speaking about. If the person described as an American is male, the word is "Amirikanits",if the person is female, it's "Amirikanka".
This word describes a person from that big country across the Atlantic that used to be (and in the opinion of some of its citizens, still is) the enemy of Russia. :P