- Similar to a pinky promise but instead The person truly can’t break the promise and must stick to their word.

- If the person breaks the promise the person they fucked promised with will give them a huge punishment. Example: Befriend, break up, or even tell them to do something embarrassing in public. Anything!! The other person desires
Karen: I’m sorry! I fuck promise that I won’t spit in ur drinks anymore.
Kyle: Fine!! If you do it again you will have to watch me spit in all ur drinks for a week straight.
by Kinks May 21, 2020
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a promise made during sex that is used to encourage continued activity. Usually, not to be carried out.
Bob didn't call Linda back the next morning like he said he would. He thought that was ok as it was a fuck promise.
by Tker December 16, 2009
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