no its not a term meaning mutt. EEs are chickens who have a known lineage with aracuanas or americanas be it 1st gen or 21st gen somewhere along the way this little guy had a colored egg layer. If it turns out to be a hen it can lay eggs anywhere in the spectrum. White to Dark Brown Green to Blue. Though EEs are in fact pretty much mutts they are called EE standing for Easter Egger which is for the color of eggs laid.