Top Definition
Verb

Taking very large doses of diphenhydramine, a anti-histamine over the counter allergy remedy, to experience sedation and vivid visual and auditory hallucinations. Abuse of diphenhydramine incredibly dangerous because it puts you in a state of pure delirium. Long term abuse of diphenhydramine has been linked to brain tumors.
Person A: Lets go over to Peter's house.
Person B: No way man that guy is blue mooning on Benadryl. He is Insane!
Person A: You're right people shouldn't be getting high off allergy medication.
by Bluemoon shine September 03, 2010

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