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Gai-happy is when you're so damn thrilled about something you're bouncing off the walls and making everyone else want to punch you. It’s like being a hyper kid who never grew up.
My cousin saw a free pizza and started doing the cha-cha in the middle of the grocery store.
My friend got a new phone and wouldn’t stop screaming about it for 10 minutes straight.
I was gai-happy when I found out my mom forgot my birthday.