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1.
1. Superficially faithful and/or spiritual; 2. Stridently and shallowly Christian.
Please stop being so McRighteous all the time, Jonah. Everybody knows you made an abstinence pledge.
by Vlad the Impaler May 24, 2007
 
2.
A sandwich from Mcdonalds that is not on the menu. Very inexpensive. Where you order a McDouble and a McChicken and split the McDouble in half and put the McChicken in the middle and eat it. It is quite very delicious.
Dude, I just had a McRighteous and it was freaking sweeet!!
by thechickmagnet March 10, 2010