The genitalia of an elderly man, or the breasts of an elderly woman.
John "Man, I heard that once you hit the age of 60, you start to develop a flap pack!"
Chris "Isn't that true!"
Sagging tits that hang below the stomach. See your grandmother for more details
My granny has some nice flap jacks
when you slap your bitch in the face with your penis.
Last night i flap jacked her in the face.
Lesbian term for a woman’s vagina
I preferred her cat flap to a mans penis.