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1.
A statement, action or decision that is unjustified, unwarranted or unreasonable in it's nature.
The fact that they gave him that scholarship over me just because he is black, even though I had better grades than him, is such bull horse!
by grapnell February 11, 2011
 
2.
A term used to describe false statements and/or lies.
Ron said he slept with that banging waitress last night... that's bull horse.
by Wes L November 12, 2005