Function: Exclamation or statement
Etymology: Canadian, particular to the greater Hamilton (the Hammer) region (Burlington, Stoney Creek, Burlington)
1. An exclamation of disbelief.
2. Means that you don't believe something to such a degree that you make an indirect reference to someone's lack of intelligence or ugly head
An expression used after a friend says something particularly stupid, potentially by accident, and does not realize it. However, it must be brought to the friend's attention in the form of light-heartedridicule.
"I think that I injured my trapezoid muscle at the gym last night."