No girl shall frequent the bathroom on her own.

NBC / BuzzFeed

1. You will always be honest with each other, BFFs tell it like it is.

2. Having said that, there's a way to deliver the truth in a delicate and thoughtful way. You look after each other's feelings.

3. You never leave a drunk friend on her own.

4. You trust each other in all situations, even when you're being a sloppy drunk. You won't set each other's hair on fire or draw penises on each other's faces.

5. You also know exactly what she needs when a killer hangover kicks in. Get me some ice cold water and a bacon sandwich STAT!

6. You can sense when your BFF needs you to hold her hand.

7. You know her brain inside out, you could order for her in a restaurant.

8. You go to each other for medical advice, no matter how gross your problem is.

9. You share all your sexcapades, no matter how awkward they are to tell.

10. You hold each other's hair back when you're ill.

11. All big moments are celebrated through the medium of dance.

FOX

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