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1 definition by nstock1283

The person in a relationship that gets too serious too soon, or is or becomes incredibly annoying.
"Hey so what happened with you and that girl?"

"Oh she's gone, she was definitely a Mary."


"How's things going with that new guy?"

"I don't know I like him but I think I might have a Mary on my hands"
by nstock1283 July 10, 2008
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