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An imaginary person that you are claiming to hang out with to fool your parents - usually in a time when you are avoiding consequences.
Hey Mom, no... we didn't steal your vodka and go to a hotel party. We were getting banana milkshakes at Dunkin Donuts with Jupy!
by jentoni January 07, 2011
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Originated from people wanting to talk about doing something illegal or thinking about it, but really make it sound like your talking about something else. All terms related have to do with Space objects

Also see - Star, Starshoot, stargazing, and comet.
"Im a redneck, i like to drink be...err jupy, Hi mom"
by Tyler April 29, 2004
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