Involves no penile or vaginal contact. It requires you getting naked. Okay, I lied, it requires penile contact. You do a leapfrog, but you're both naked, and the guy leapfrogs over the girl, and the penis drags all along the backside of the girl.
Jeon Jungkook has a perfect example of a bunny smile. He even looks like a Bunny
A Bunny smile is when a person has their two front teeth, a little ( or a lot ) bigger than the average size, causing them to look like a bunny. So when they smile, they have a "Bunny Smile"
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.