A person who purposely trys to bring pain, dysfunction ,chaos or any kind of negative with the intent to try to teach a lesson in some way hoping that it will destroy whateverbeauty or strength that a lowlife can not endure.
Only a lowlife would try to take from a friend who had less than he did.
An urban lowlife is one of those people who submit people's names as urban dictionary definitions that have to do with their personal life. Whether they define the person as good or bad, it's still annoying as hell.