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To be present in a group of friends or acquaintances, and suddenly disappear from said group, never to be seen again that night.
"Dude, I was talking to you last night, and then you completely disappeared."

"Ah, sorry man, I sketch off at the worst times. I'm going to the doctor next week to see if I have sketcholepsy"
by Maxer64 November 05, 2007
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