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1.
Leader of the Evil League of Evil; the thoroughbred of sin.
Bad Horse! Bad Horse! He rides across the nation, the thoroughbred of sin! He got the application that you just sent in!
by approximation January 16, 2009
 
2.
verb: While a person is reading a letter, when a group of people stand behind the person and sing the contents of the letter to that person. Often done in costume.
Did you see the youtube video of Felicia Day getting bad horsed at PAX 08?
by N8y June 09, 2009