I don't think my brothers read this, but if you do, maybe you would like to stop now since this is addressing Granny's (aka: Mom's) Fanny -
Background: since Princess was a baby I would give her rump a pat and coo "Princess has a cute butt!!!" I was surprise one day when getting ready for a bath I saw her take her diaper off and walk towards the bath tub patting her own behind with both hands coo-ing "cute butt, cute butt"
This has now developed to patting other family members butts and saying the same "daddy cute butt" "mommy cute butt" and so forth. Even if a bare bottom was sighted whom-ever saw it would comment on it's cuteness!
Scene: Grandma, who has been a widow since I was 3 years old, is staying with us for the weekend. We are sitting down for dinner.
"I was getting out of the shower just when Princess walked in" Grandma started (by now I knew what was coming!) "and she surprised me by patting my behind and telling me I had a cute butt!"
"It's been 30-odd years since someone has admired my butt!"