footsie

noun3

1. •
   A flirting game where two people touch their feet together, under a table or otherwise concealed, as a romantic prelude.

   • Play “footsie” with him while dining out together. — 1995
2. •
   A foot.

   • “Mother — Mother will you tie up my shoeies?” Susan’s lisping voice interrupted their conversation. / “Put a footsie up here,” Babs sang out. “’At’s a girl.” — 1956
3. •
   (slang) A selfie (self-taken photograph) of one's feet.