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(n.) The fluttering sensation of "butterflies" in one's stomach, increased heart rate, instantly improved mood, and a silly smile.

Gillypitters are most often given and reciprocated in loving and/or budding puppy-dog-eyed relationships, but can also be caused at the interaction or sometimes the mere thought of a particularly strong crush.
"Baby, you're the love of my life. You give me gillypitters whenever I see you!"
by PoisonRing Crane March 05, 2009
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