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1.
1) A cow that has some religious significance
2) An expression of amazement
1) I'm going to pray to the Holy Cow for rain.
2) Holy Cow, I have a large weiner.
by u n h April 24, 2003
 
2.
a term which is often exclaimed by a party in disbelief. Usually the person who uses such a phrase will originate from the midwest and may or may not be named dave.
"someone's at the door, should I hide? she's pissed, is it your wife?"

"holy cow! let me hide with you!"
by MintyLeila June 25, 2005
 
4.
The product of crossbreeding between a holy shid and a tigur cow, having features of both but generally being larger than either.
In the year 2088, scientists believe that the new breed of geniuses, namely HolyCows, will forever rule the earth resulting in complete peace.
by discodork September 12, 2003
 
5.
Slang for a church organ due to its large and bellowous nature.
...and they all gathered around the holy cow and sang hymns.
by boogers_megee April 27, 2009
 
6.
The common name of the Great and Powerful Bovine Lord in the Sky, Who Will Pass Judgement Upon the Earth. Or so says my cult.
Oh great and mighty holy cow, please accept this sacrifice of a human heart
by RabidWombat June 01, 2004
 
7.
A reference to a cow's religious status in India.
I drink organic milk.
by sukebe September 19, 2004