Don't have a cow — it's just a small scratch.
have a cow
idiomTo get angry; have a fit.
Origin
disputed originUnknown. Popularized by the TV show The Simpsons where it was one of the catchphrases of Bart Simpson.
My mother had a cow when she saw the mess in the kitchen.
The manager had a cow when the shipment arrived three weeks late, shouting at suppliers until his face turned red.
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cow juice
Cow’s milk.
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holy cow
An exclamation of surprise or astonishment.
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sacred cow
Something which cannot be tampered with, or criticized, for fear of public outcry. A person, institution, belief system, etc. which, for no reason other than the demands of established social etiquette or popular opinion, should be accorded respect or reverence, and not touched, handled or examined too closely.