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The act of being screwed over, fucked over, or hung out to dry by a person previously deemed as a friend. This act is particuarly painful because the person committing it was thought to be your friend.
"Dude we got totally flinned when he left us at the concert without a ride home."

"That motherfucker has flinned me for the last time!"
by Delmas March 09, 2008