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A girl's name. Kaithlynn is a name for a hot mess who's smart as hell, laughs at your jokes even when they're bad, and will buy you pizza just because she feels like it.
"You're my favorite hot mess," he texted her after she spilled coffee on his shirt.
She DM'd him: "I’m buying you pizza because I feel like it. No questions."
At the party, she laughed so hard at his joke that she fell off the couch.