A gesture originating from the Northern Irish county of Fermanagh but used in both halves of the country. It is used whilst driving on Ireland's roads, especially country roads where one often needs to give priority to other drivers. The index finger (usually of the right hand) is lifted an inch or two from the steering wheel as an acknowledgement.
Well I've let him pass, and he's given me the Fermanagh Finger so he has.
by Corporal G September 26, 2008