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
1. usually means someone very happy with good luck and amazing social skills
2. someone who is hilarious and extremely good at making friends
2. someone who is hilarious and extremely good at making friends
by Sophizzlemadizzle September 8, 2006