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"
As a noun, this slang term refers to individuals that are quick to offer a disingenuous handshake and smile. Although interest and affection from this person may seem legitimate, the severity of their fakery can range anywhere from half-hearted respect of social customs to malicious attempts at separating an individual or group from their money and dignity.
May also be used as an adjective, referring to the act of engaging in the above behavior.
Popularized in 1996 by Maynard James Keenan as lyrics in the song Γnema, performed by the band Tool.