'jk' is short for joking, kind of like 'lol' in a way, then 'rowling' is rolling on floor laughing (rofl). so together it means im just joking and laughing my head off with the added pun of being j.k rowling the famous author.
"Wow he's really hot"
"Um are you being serious"
"No hahahaha I'm jk rowling you"
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