When you think that you want to cheat on your girlfriend, and then right as you are about to have sex you decide to change your mind because you feel guily, which is a great time to get a guilty conscience. This is called a fold, it relates to poker because when you go ALL IN you can't fold.
1. when you want to fight someone and you can't back up your words. thats a benfold.
2. when you decide that you're only gonna sorta cheat on your girlfriend.