1. out of trouble or free from an obligation, very fun or cool
let someone off the hook too easily for something
To be off the hook means to no longer be in difficulty or trouble or to be relieved from an obligation. With old telephones which have a receiver- to leave the phone off the hook means to take the phone off the receiver so that it is unable to receive incoming calls. If you say a phone has been ringing 'off the hook' it means the line has been so busy you have not had an opportunity to put it down. If you are off the hook, it means you have gotten away with something or are no longer responsible for something.