A person who is addicted to face book, much like a alcoholic is addicted to the bottle. These poeple post every stupid aspect of boring life on facebook as though it is some earth shattering news. They belive in thier simple minds that people actually care about what they have to say, and can't wait for more of their mindless dribble. When in fact all poeple will usually do is just hide these mother fuckers, to get them off their screens.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”
Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.