Top Definition
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 02, 2008
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