Amorous and clandestine touching and rubbing of feet between a couple; pedal dalliance: I played footsie with her during Carmen
Any especially close relationship between persons or parties: Truman is plenty burned up over the way Chiang Kai-shek played footy-footy with the Republicans(1935+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with play footsie
Behave coyly, flirt with, especially secretly. For example, Get to the point, there's no need to play footsie with us. This expression alludes to two persons surreptitiously rubbing each other's feet together.
Cooperate or curry favor with in a sly or secret way, as in The mayor's been playing footsie with various neighborhood councils.