Inner Thigh Rub. Rubbing the inner thigh of a woman who obviously likes you, but you adamantly deny liking back. An ITR is performed in public with limited attempt to conceal from onlookers. Frequently a second woman will become enraged with jealousy when witnessing and ITR and later spit insults about the ITR recipient to the guy.
John: "Eric that ITR on Janis last night wasn't very discrete"
Eric: "Yea I guess you're right. Terry saw too and got very angry with me. She asked why I would do that with such an ugly girl."
John: "Wow she said that? She must have been really pissed. Janis is pretty good looking."