The uncommon sexual act of when Partner 1 takes a laxative and then proceeds to let Partner 2 perform oral sex on their anus. Whilst this is taking place, Partner 1 will then defecate into Partner 2's mouth. Then Partner 2 will gargle the feces and spit it back into the anus. Finally, Partner 1 will defecate once more and Partner 2 will swallow the feces.
Partner 1 - "Hey baby, do you want to tryAss Cacking tonight?"
Partner 2 - "Um, I'm not sure what that is..."
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.