This is when there is one female and four males that all have over-sized penises are having "gang banging". The girl must be getting sexual pleasures from the anus, vagina, mouth, and breasts. All four men ejaculate simultaneously and she will be "full from your cream". The Texan part of this term comes from the saying "Everything's bigger in Texas" and the "cream filling" comes from your sperm and the other three's sperm "filling her up".
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.