An eater is a word guys use to call girlsskanky or slutty. Girls that basically give it up to anyone and/or are just slutty and dress that way are considered eaters.
Fred: "Kelly, I heard you've been sleeping with all my friends. You're such an eater!"
A thotpocket who eats the d*ck up very well and everything that comes with it. Usually has multiple sex partners and no father figure, is notoriously known for eating d*ck well.