ewwster Share definition Flag Somebody who Ewwwwwws Everything, Even when its a joke or it doesn't make sense to eww it. Boy: Aww Look at that rat its so cute Girl: Ewww Boy: Take a Joke Girl! Your such an Ewwster ewwster by Hahathatkid July 7, 2010 0 0 Get merch Get the ewwster mug. Buy Now — $32.95 See more merch