It's what the bitches do at night when they can't sleep during their sleep overs. When pertaining to pre-teens their clothes are usually on.
Jessica: Sweet sleep over your mom let us have Brittany.
Kelly: You girls are the best!
Jessica: BFF's forever guys.
Brittany: Mmm, Bryan Jennings hugged me today, I think he's so cute. I can't sleep. He's so (wet) dreamy.
Jessica: Hey guys, you know what?...Pillow Fight!
Brittany's Older Sister: You girls should grow some tits.