Put "...or whatever" at the end of a sentence to show that you're not talking about only one specific thing. For example:

She's always asking for money for gas or whatever.

This means that this person asks for money for many things, including for gas.

Another phrase with a similar meaning is "...or something":

He said to get him a hamburger or something.

The difference is that "...or whatever" is more negative. You use it when you're talking about something that you don't like or don't think is important.