A Thumb Promise is a promise stronger than a pinky promise. It shall never be broken, and if so, then the person who broke it may never be trusted again. Crossing your fingers does not invalidate a thumb promise.
by syylent June 8, 2024

by hiswife May 18, 2022

by Ty12gy34 February 14, 2021

by dtm person July 16, 2022

The act of, rather than sticking your thumb in her ass while you're fucking her, you pull out, shove it in her ass, and plug her vagina with your thumb
by Boost_and_chill May 20, 2021

by AskPhantoms June 4, 2024

by Rzzlations! April 10, 2022
