It is what is...

This saying is meaningless filler to use when you are too drunk to articulate support for an argument or cohesive justification for a statement. :idunno:

Once heard, people process the statement in their mind and cannot dispute your claim. People will just move on to the next topic once this is used. Since you have reduced your argument to an obvious comparison of "it" with "it," there is no need for further debate.