Instant and sudden removal of a facebook friend from your news feed due to a dumb, irrelevant, inane, or otherwise objectionable status update.
Facebook friend on news feed's status update: "Is CONEY ISLAND stylin!!! Gonna be 105 degrees 2day, def on that Q train to the beach!!! happy bday shoutout to my dude Quichua!!!"
Facebook user: "Ugh. That's a feedkill."