What is Fanny Slap?
1.
a female actually slapping someone on the face with their fanny. Usually the victim has to be laid down unless the female is particularly versatile.
James: Damn! last night i thought i was gonna get some
Kelvin: oh yeah? what happened?
James: She threw me on the bed but then just gave me a massive fanny slap!
See
2.
When you physically slap someones fanny, as a punishment for a bad blow-job.
girl, that blowjob was sooooo shit your gonna get a right fanny slapping!
See
