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1.
inf. to overreact disproprionate to the situation at hand.
1a. "When my sister found me screwing her friend Becky on her bed, she had a cow."

1b. "Is she kissing him dude? I'm about to bash his &*%ing face in!"
"Don't have a cow man. Let the slore ride."
by redgyul September 24, 2004

Words related to to have a cow

ride slore
 
2.
an alteration of the term ' to have kittens' to strongly overreact to a situation.
I scratched my Dad's car and he had a cow -now I am not allowed to borrow it for a year!
by Intensity January 09, 2005