Word also meaning, "cool." This term recently arose in the New York City area as a slang term for not only physical money but for meaning, "awesome," or, "nice."
"yo u going to smoke?"
"Yea, son wbu?"
"Of course ma nigga."
"Thas cash."
Alternative to money. Like money, the term is used to describe anything that one might find especially favorable or pleasing.
Synthesized etymology: Much like with the colloquial expression "money in the bank," the target of discussion is being likened to the desirability of cash.