Pulling a Kelsie can be defined as being a complete uber bitch to someone, then just saying something cute and naive to try and get out of it.
Kelsie: "wtf you're such a slut f*#k you!"
Layla: "excuse me?"
Kelsie: "What, did you fart?"
Layla: "..grow up"
Kelsie: "I like apples and bananas!"
Layla: "Way to pull a Kelsie"
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