Also widely used outside of the Midlands to refer to an individual from any part
of the West Midlands region. This has an empirical basis since the most distinctive
traits of the accent are common throughout the region.
Even used in this sense it's generally not taken
as derogatory (even if it's often meant as such). The exception is people who
don't consider themselves Brummies - either because they have a local identity
distinct from Birmingham (like Black Country) or because for whatever reason
they prefer to deny their Midlands heritage altogether.