Between really good friends ("carrot friends", my mom calls them), you don't need to say anything. There's no need to entertain. There's no need to carefully word everything you say. There's no need to be embarrassed. You can just be yourself.
They love you for all your quirks and goofy smirks. All your flaws and blah blah blahs. They'll never judge, but will keep you straight. No matter what, they think you're great. (Like I know this "poem" was really corny, but that's okay!) With good friends, you value their opinion and care what they think of you. But you don't need to try so hard to get their approval.