<human>: Provide a brief overview of the text.

Last night, my girlfriend and I were watching TV when she got a snapchat from her best friend.  I didn't see exactly what it was, but I assume it was a picture of her making herself look fat or something.  I got up and went to the other room, and about 20 minutes later when I came back my girlfriend was taking pictures of her stomach rolls, giving herself a double chin, and basically they were snapping each other back and forth pictures of themselves looking fat and ugly.

My girlfriend was laughing the whole time so they were doing this in good fun, but it really struck me as an odd behavior.  I've known them both for a long time, and it seems like they both have some issues with their body/self image.  Maybe it's just cause they're girls.  But for example, my girlfriend takes about 2-3 hours to get ready to go anywhere.  She has to try on 8 different outfits, ask me which one she looks least fat in, then try them all on again, and throw at least 2/3 pitty parties because nothing fits right.  Her friend is the same way when they get ready to go out together.

There was a night a few months ago when they went out drinking together.  Afterwards, they went out somewhere to eat.  When they got back to the house, they talked about how much they ate for like 2 hours, and they thought it was so hilarious that they stuffed themselves with so much food.

I guess I just don't know what to think of this.  Part of me thinks they are just being normal girls, laughing at their insecurities.  But part of me feels like something is not right and not normal with this type of behavior.  If someone else called either one of them fat, it would be like the biggest insult in the world.
<bot>: My girlfriend and her best friend snapchat back and forth pictures of themselves looking fat and ugly.  Is this normal or some sort of self-harming behavior?