Just that really. I find it's used a lot where I live, as a proud boast to the tons of toys the children have received at Christmas or even an adult has received. Usually from those who are financially worse off.
I had never heard it used in this way before, only in the context of an over indulged child.
I can kind of understand it, I was brought up in a really poor area, (70s. 80s) but many people dripped in gold, so I think it may be a similar thing?