1 definition by BA27GT

most people know of the term 'facepalm' (if not, see facepalm pre-reading this)

facehorn is a derivative of this action whereby the horn of a car is activated by the slamming of face on steering wheel. This is generally in reaction to someone doing something fucking stupid (earning a facepalm) which results in them being a cunt on the road (earning a horn blast).

the facehorn allows the road user to encapsulate two reactive emotions in one fell swoop saving both time and energy.
quite simply something such as a person turning the wrong way down a one way street resulting in a traffic jam. - you facehorn

another example is when someone goes straight when the green turning light comes on. - you facehorn
by BA27GT February 22, 2011
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