The act in which a person who is on their knees (typically female) is giving a blowjob to which the person on the receiving end, at their climax slaps the ears of the person giving head and cums in their eyes simulating a flashbang.
"I was doing the russian flashbang flashbanging to this girl the other day, you know when you cum in her eyes and tug on her ears at the same time, then I got raided by the FBI... The worst part is that the Spetsnaz joined in."
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.