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1.
Acronym: Unidentified Boyfriend-Like Object.

A term used to refer to a male of significance in your life whose relationship is vaguely or unclearly defined. See Also: U.G.L.O.
"So, are you dating him? You are together a lot."

"No, right now he's still an U.B.L.O."
by Demongrey August 28, 2012
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