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Someone fake, or not true in their intentions. Could also be used to describe someone who is immune to heartbreak, or lacks emotion.
1. She just got dumped but she seems perfectly fine! She must have a plastic heart or something!
2. "Oh heartbreaks hard when you don't have a plastic heart, you suck me in through the cinnomon stars."
-Just Desserts by Marina and the Diamonds feat. Charli XCX
by Plastic Heart January 17, 2015
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