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.
Last night, we wanted to get it on, but we wanted exercise too, so he gave me a frog smile.
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"