Someone who talks shit about someone then goes and hangs out with them; acting best friends with them too. Also someone who plays two people at once by talking shit about both to the other. Generally popular, bitchy, white girls.
Brittany: omg Lauren is so fake
Zoey: bruh that’s fax, just yesterday she was talking about how much she hated Kelsey and now she’s hanging out with her...
Brittany: yah fake bitch