Feeling anxious, paranoid, scared, or worried.

Origin: when you hold a hamster and he gets anxious, and you can feel his little heart beating out of his chest.
"Hey do you see the cop that's following us?"
"Yeah man, he's giving me the hamster heart."

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"My girlfriend says she's late this month... I've got the hamster heart."
by Thefish July 11, 2017
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