This is a phrase used to express resignation to a situation that one has no control over, where the person making the statement acknowledges that there is an
issue that needs to be addressed but implies that the
issue is beyond his control,
power or pay grade.
co-worker : Don't you think we
need to inform our clients that their bank
may be going under -receivership?
co-worker2: I don't know man, I only
work here...