The Yupik word "Gussuck" refers to any non-indigenous person; it is a derivation of the word cossack
, and thus can be dated to early Russian colonization of Alaska.
In literature it is used by author Leslie Marmon Silko in the short story "Storyteller" which depicts a clash of cultures in Bethel, Alaska.
It can have a negative or joking meaning, perhaps like the word Yankee
used by someone from the American South