When your boyfriend dumps you, when you catch him cheating, when you're feeling overly depressed, when you're feeling sorry for yourself, when no one will listen, when you're cat gets run over, or when you just simply want some ice cream, Ben and Jerrys will always be there for you. Always.
Fuck diamonds, Ben and Jerrys is a girls best friend.
A 'fall out girl' is a typical fangirl of the band Fall Out Boy. They squee whenever they listen to Sugar We're Going Down, and basically talk like this:
"OHMYGAWD! PETE WENTZ IS LYKE sooooooo HAWTT! *SQUEE!* Lykee I LURVE THARNKS FR THA MEMOREES! *SQUEE!*"
Basically, they love the band for Pete, and only Pete. (and maybe his dick).