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Someone who becomes devoted to something too easily or gives their heart away quickly. They might be easily upset by things going on around them.
Be good to her; she wears her heart on her sleeve.
by Dana October 03, 2003
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2
What happens when you pet a tiger.
While camping in the jungle, Betty Sue found Billy Bob with his heart on his sleeve.
by Katie Svensen October 06, 2003
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