Now, most think it is simply a lazy ryme, but it's much more deep than that. Being "single like a Pringle" means you don't want to be single. Everyone is ment to be together, or at least in groups, and your alone. No one loves you. Hell, who the fuck would buy a can of Pringles if it only had one Pringle? Wich means your destiny is to be thrown away and eaten by rodents or a homeless person. Your pathetic and worthless. No one will ever want you. Ever. No one would even blink if you died you discusting Pringle.
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.