A new-comer to Alaska, ignorant of the terrain, the weather, the animals, the culture, the necessary driving skills in the winter, etc. Opposite of a sourdough.
-Did you see the 90-car pile-up on the Glenn Highway this morning on your way to work?
--Yeah, and how much you wanna bet that it was all caused by some goddamn Cheechako at the front of the pack?
A man who has sexual relations with another man
Mkay called gray hare a cheechako, therefore he must be gay.