Footsie (noun)

1. A playful or flirtatious act in which one person uses their feet to touch or play with the feet of another person.
2. A playful activity where people put their feet under a table or other surface, usually in a flirtatious or secret manner.

Origin:

Derived from the word "foot" meaning the lower part of the leg and "sie" which is a slang term meaning a playful or flirtatious act.

Examples:

1. They were playing footsie under the table during dinner.
2. The footsie was a way for them to communicate without being noticed.
3. The footsie was a subtle way of flirting in the office.
4. The footsie was a game they played as children.
5. He was accused of playing footsie with the intern under the conference table.