I'm not mad at it phrase
Used to indicate satisfaction or approval in a litotical manner
Do you think I wear this hairstyle well? - I'm not mad at it!
Used to describe something is fairly good or acceptable
Used to mean that everything will be fine and you don't need to worry
Used to say that a performance, event, etc. will be successful despite poor preparations.
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.