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A ridiculously cute girl who is incredibly random. Also, actions which are particularly cute or childish.
-a cute girl pretends to be a dinosaur-

"Wow, that was so GemGem."
by awesomeneeess June 20, 2007
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A name for someone who is more than a gem, but a gem gem. They'er sparkling and awesome! They are shining!!!!
"Ella, you're such a gem gem."
by Margot Lance May 29, 2018
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