When you stick your thumb in a girls butt during sex. You've gotta love it like it's your last.
Person 1: Yooo how was your night?? Did that girl sleep over?
Person 2: Ya lmao I thumb butted I think I love her.
by BigKidsAreLarge November 9, 2016
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When you are hitting it from behind and have your thumb in her butt at the same time. Thumb-butting it.
She seemed like she wanted it so to test the waters I was thumb-butting it.
by Blibicer November 27, 2017
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