The slapping sound that is made during sex when the two participants' thighs slam into each other
Dude you and Jenna were having so much sex last night.

No we weren't!

Yes you were! I heard at least ten thigh fives come from your room!
by Spencer Ace September 26, 2018
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A thigh five is a greeting or a salutation extended between two women (or men...if you're so inclined or daring due to proximity of junk) by gently slapping right inner to the other person's right inner thigh with the same pressure as a standard high five!
Me and Bonnie, who I hadn't seen in a long time, gave each other a "thigh five" upon being back together again.
by Sunny Sweeney August 31, 2015
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The urge to put your hand between an attractive woman’s legs (thighs) and move it back and forth in a “slapping” motion.
Look at that girl over there; boy, I sure would like to give her a thigh five.
by Granfunk July 21, 2020
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