1 definition by Singledee

Top Definition
(noun) Acronym for Early Morning Urinary Boner. This is when you wake up in the morning with a rock-solid hard on because you have to pee really bad.
Girlfriend: Keep your boner away from me. It's too early and I'm still tired.

Boyfriend: Don't flatter yourself...it's just an EMUB.
by Singledee December 15, 2011

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