Literally X means _to do X to the extreme/to the highest degree_. Practically, it is an expression to emphasize the degree of X.
is almost a set phrase, it means _to rob/rip off (someone) mercilessly_ or _to take whatever they want_ in the particular context.
Similar usage:
* to behave violently in the worst possible way.
* to eat every possible gorgeous food/to enjoy a variety of gourmet meals