1 definition by McKnowItAll
A double cheeseburger (plain, just cheese + meat) with an entire Mcchicken (buns, lettuce, mayo, and all) sandwiched in between.
John Smith bought a (plain) double cheeseburger and a mcchicken and is combining them into a Mchappiness. What a lucky fuck. And all for only $2.12!
by McKnowItAll December 2, 2008