The term is derived from experiments where a rodent is put into a maze containing a delicious piece of cheese (perhaps Roquefort) that is hooked up to a wire that shocks the rodent. The rodent keeps forgetting that's the shocky cheese.
Coined by 710 KIRO AM radio host Luke Burbank on the show "Too Beautiful To Live."
Example # 2 - You hate the owner of a certain espresso company and have decided not to frequent one of his millions of establishments yet due to the convenient location and consistant yumminess of their products you find yourself in line and just after you have placed your order and are handing them your money you remember you hate the owner and do not want to give him anymore of your money it's too late...ZAPP!!! Shockycheese.