When two, sitting, people are flirting by touching knees usually under a table. Similar to footsie but is better done while sitting side by side or kitty corner, and is less likely to cause outbursts of laughter. Also the recipient often wonders if the kneesier is doing it on purpose.
Q: Was that creep playing kneesies with you too?
A: Yes, my knee will never feel the same.
by Mary Jo8 January 13, 2009
A form of practical martial arts involving thrusting the knee into someones thigh or knee. A painful experience that doesnt cause lasting harm physical but can mentally cripple a man. Few people can actualy Kneesie but in fact threaten others with it. Outlawed in several states and legend has it that it originated in a school field when a JEEP assaulted a member of the general public resulting in him being Kneesied into a rugby post.
Touch me and I'll kneesie you!
Carry on like that and you'll get a Kneesie!
by Adam Cooper September 16, 2005

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