An untrained no-good is male/female that has no intention of doing any good in this world and is just overall, untrained. Most if not all need to be trained and abused if needed.
There are many examples of untrained no-goods, for example if you leach around while i smoke weed and nag at me for hits so you can get your little fix, you are very untrained and most definately a no good. Another great example of an untrained is slutty teenage girls who commonly get intoxicated and "slut aroound". They tend to puke everywere and annoy everyone at parties.