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A variation on the term facepalm. Used when someone or something is so stupid you would rather be hit in the face with a bus than endure it any longer.
Gigi: I was doing a meme on DeviantArt and in one of the boxes it came up with "Sasuke receives a gift of sexy lingerie from Itachi what is his reaction?"

Star: *facebus* Incest = NFTW (Not FTW).
by StarDustCrazy July 17, 2010
When something fials so much a facedesk doesn't evcen begin to cover it.

you slam your face of a bus that's coming towards you :D
Delly: Hey Git, you are from English yes?
Dan: Fail
by NorthenBrittishkiddie January 08, 2011