Top Definition
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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