When you dislike someone so much that anything they do, no matter how minor or inoffensive, annoys you beyond any rational level - exemplified by the sentence "look at that bitch eating crackers like she owns the place".
A bitch eating crackers is someone (male or female(but usually female)) who no matter what they do like eating crackers pisses you off. Usually has a low IQ or intelligence. Other versions of the phrase include Bitch eating chicken.
A giant, pushy, stuffy woman, typically with an abnormally large ass, cotton pants, and a pushy attitude, who consumes (at times in mass quantities) the "Toscano" sandwich from the local Italian deli (which contains provolone cheese and spicy Italian sausage).
One can only assume that they also have a large turning radius, hence the "giant".
The type of girl you take out on a date who sits quietly, orders a salad, and shuts the fuck up. Many times, nothing is more infuriating than the quiet, salad eating bitch sitting in the booth of the Ruby Tuesday's, eating the Mandarin Chicken salad.
The kind of bitch you have to initiate every sentence with, and answers in short, meek replies.