This is another name for the creature known as "Sasquatch". Other common names include "Abominable Snowman", "Yeti", "North American Great Ape", and "Bigfoot".
The term Samsquamch arose from the popular Canadian television show "The Trailer Park Boys" as coined by the character Bubbles as played by Mike Smith.
ex1. Bubbles: What if its a samsquamch? Julian: bubbles they dontexist. Bubbles: you tell that to all the people that got eaten by them. Greasy bastards.