play footsie (with somebody)
to secretly touch someone's feet under a table with your feet, in order to show that you are sexually attracted to them

[TahlilGaran] Dictionary of Contemporary English ▲

play footsie
[informal]
to secretly touch someone's feet under a table with your feet, in order to show that you are sexually attracted to them.
I think they were playing footsie in the meeting!
(usually in continuous tenses)

[TahlilGaran] English Idioms Dictionary ▲

play footsie
v. phr., slang, informal
1. Touch the feet of a member of the opposite sex under the table as an act of flirtation.
Have you at least played footsie with her?
2. To engage in any sort of flirtation or collaboration, especially in a political situation.
The mayor was suspected of playing footsie with the Syndicate.

[TahlilGaran] English Idioms Dictionary ▲