Buff chuff
A Buff Chuff relates to a womens vagina that is particularly good to look at, a fine example of the female sex organ.
"Your nan has a buff chuff for her age, Dave!"
Buff her chuff
Giving her a good session of anal, coz she's a yoghurty fucker after multiple sex sessions of cum dumping in the vagina. So you decide to use the rear door and "buff her chuff"
I went home with her and she was well up for it. I didn't want to stir someone else's porridge so I decided to buff her chuff