Originating from the words shop and talk, it began used when discussing all things relevant to the Vancouver Canucks. It has now evolved to be used in countless other applications (see examples).
"Hey Shappy, how's the shap?"
"What's your shap on the game?"
"You shappin' over later?"
"You hear that milt's shap on Luongo?"
"I got shap!"
"Your shap is the top shelf, milt free!"