from Wiktionary, Creative Commons Attribution/Share-Alike License.
flirtatious touchingusing the knee(s)
Sorry, no etymologies found.
Someone has to knit the beginning until it is large enough for several people to sit around it without playing kneesies or hurting their back from bending forward.
He acknowledged that they kissed in his apartment and played kneesies under the dinner table when he was dining out with her and her parents.