Taken from the backhoes with extend-able necks, an Extendahoe is any female that is both a) a hoe and b) known for sticking her neck in your business when it ain't her business. Most commonly seen at parties. Often appear at inopportune moments.
Last night I was at a kegger and this bitch kept trying to join in mid-conversation between me and this other girl. She was being a real extendahoe