Thomasville slicker is the act of using oil to lubricate the asshole of your girl. Once the asshole is effectively oiled up you take her to the nearest Thomasville with baseball bat in hand. Bend her over one of the beds in the Thomasville and proceed to buttfuck the shit out of her with a baseball bat until security comes and asks you to leave.
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.