It means, roughly, a gatherer of money or wealth. "Scrilla" is a term onse used by rapper E-40 to describe money or wealth of any sort. "Monga" is a shortened version of "monger" which would describe someone who traffics something (Think fishmonger or hatemonger).
To a friend who just got a high-paying job- "You are one dope scrillamonga."
n. A word used to desribe someone who, contrary to reality, believes that they are infinitely wealthy. A scrillionaire is typically indicated by frivolous, unwise, and flashy spending.
Now that Tyrone's a scrillionaire he even put rims on his toaster.
A person who takes a dick up the ass till they shit bloody cum and then they inject the bloody cum into their eyes, and they run around saying they are high