Definition of JohnnyJohnny: A hospital gown. A johnny is a short collarless gown that ties in the back, worn by patients being examined or treated in a doctor's office, clinic, or hospital. Johnnies are generally disliked by patients as skimpy, ugly, ill-fitting garments often leaves one's backside ignominiously exposed. In British slang, a johnny is also a condom. Last Editorial Review: 6/14/2012
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