Granny Finger 

You stick your fingers in her coochie until they become all wrinkled then stick it in her rear

i gave that bitch a good ol' granny finger the other night

Granny Finger by H T X November 15, 2020

granny fingers 

When you've been in the water for a long time and your fingers get fat and wrinkly like someone's gramma

"Damn, Lester, you've been swimming in the pool so long you've straight up got granny fingers!"

granny fingers by Lombard South May 17, 2016

Granny piss-fingers

The term used to describe old grannies and their lack of cleanliness.

" The old lady from across the road has brought cake round again."
" Fuck off, i'm not eating anything that comes from that old granny piss-fingers

Granny piss-fingers by TK.uk15 May 12, 2011