Being shown the car is a euphemism for being let go by your boss or for mass layoffs because of budget cuts or because of a massive loss in profits or because the higher ups spent the money on themselves!
This euphemism originated from bungie’sCEO firing half of the workforce to buy some cool cars but before he let them go he showed them his car collection!
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.