This is a black person who neglects their children due to a crippling heroinaddiction. They can be found in nearly every city. You may have even given one a "dolla" when they asked for it.
A person who is mentally consumed by an addiction to money. Every aspect of his life suffers as he/she satisifies the addiction.
Friend: this sunset is one of the prettiest things I have ever experienced.
Money junkie: yeah, thanks God sunlight is free.
Friend: aren't those kittens meowing charming?
Money junkie: yep, but cat food is so expensive...
Friend: Do you think that Plato's Republic has any valuable ideas for today's problems?
Money junkie: damn, my portfolio devaluated 2 cents today. Sorry what's that you said?
Partner: do you love me?
Money junkie: how much will it cost me?
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.