"Foxy's Hole" is a nursery rhyme game to play with little children.
Put your finger in Foxy's hole,
Foxy's not at home
Foxy's out at the back door
Picking at a bone.
Put your index and middle finger of one hand over the index and middle finger of the other hand. Leave a hole in the middle for the child to put his finger in. If he does, gently nip his finger with the fingernail of your thumb.
"It is thought to originate from the Tudor period." -Wikipedia