(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 6, 2009
Get the Gillypitters mug.