Scots term for a rabbit's tail, hence the slang derivation meaning female pubic hair. See also fudarea
As the wee bunny hopped off you could see its fud bouncing up and down
Gie's a swatch at yer fud, darlin'
The general zone around the Fud
. An especially pleasant zone is known as Upper Fudarea.
"Are you going anywhere nice with your girlfriend this evening?"
"Yes, Upper Fudarea"