Top Definition
Cowbell Deficiency, also known as CBD, is an extreme medical condition. Victims of CBD are known to have high fever. The only known prescription of CBD is more cowbell.

Talk to your doctor if think you are suffering from CBD.
Intern to Doctor

I: "Doctor we have a new patient"
D: "What does he have"
I: "The only visible symptom this man has a fever, but it looks like he is dying."
D: "<softly>Cowbell Deficiency"
I: "What?"
D: "This man...has a fever...and the only prescription...is more cowbell."
by geniusonwheels February 06, 2009

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