Sarah needs to get something off of her chest. Her feelings about the wicked Amber B., who has perpetrated perhaps the greatest sin on the lengthy list of bad things bad girls shouldn't do to each other. She has committed rack slander.
In a fit of high dudgeon, Amber has accused Sarah's impressive fun bags of being less than God-given, a C-cupped gauntlet that will not be ignored or forgiven in the dangerous world of questioned bad girl boob cred.