Dogsworth is a word that originated in the Willoughby area of Sydney Australia back in the late 1980's and continued by popular demand well into the 1990's, it was started by a group of friends who's ethnic backround's are Croatian, Italian, Lebanese and Armenian to name a few. Dogsworth is best used to describe an individual who is a dog of a person, its worse than calling someone a dog, you would normally use it to brand this particular person and give them a new found identity
you would use this word to brand a person who has double crossed you
for example if this person was a friend you would say:
YOUR A DOGSWORTH MATE!