Verb describing your reaction to something so profoundly idiotic that it makes you want to knife yourself in the face to block out the unbelievable stupidity you are faced with. A form of "facepalm" taken to the extreme.
"Derperton asked what state Montreal was in the other day. What a dumbass."

"Wow...faceknife."
by Frickermann March 10, 2012

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