When a chick has been fisted so hard and so regularly that they have become excessively loose. Their flaps(labia) will extend or stretch down to an astonishing length. Sometimes up to 2" (or 5cm) lower than the outer lips. A spambutterfly is acheived when the inner lips(labia) are stretched out beyond the outer pussy lips and create a butterfly wing formation.
"I scuffed her cuntscuff ya cunt so hard before pulling her lips out beyond the mess I'd left. MuaHaHaHaHaHaHa
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.