Top Definition
Acronym for "Kill Yourself In Real Life."

Typically used in video game and/or internet humor. Said to someone who is a camper in a video game or said to someone who is a lowlife.
"Look at that guy wearing a So-Cal Coop Shirt. Kysirl."

"Wow! Fucking camper, go Kysirl!!"

"You're so byaaaad, Kysirl!"
by chayzun69 January 07, 2012

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