Obnoxiously Literal-Minded One. A person who takes sarcastic or tongue in cheek comments literally, either because they honestly can't tell the difference, or because they know it will piss you off.
"Yeah, I love having mono. It's the most fun I've had all year."
"Really? That's pretty weird."
"Shut up, OLMO."
by maryla September 04, 2007

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