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.
Used to describe a situation when people say nothing and feel worried, embarrassed or uncomfortable
A heavy silence fell upon the room after Jane refused John's proposal.