Define Live Fast, Die Young Meaning

They tend to be rockers, glamorous, rich and / or famous, with tragic deaths.

Expression meaning take lots of risks, have lots of fun, and don't suffer through old age. It is implied that the first half of the expression is what causes the second half.

bad girls do it well.”
In the context of this song, M.I.A. speaks of “bad girls” in terms of empowerment, calling women across the globe to stand tall against forces that try to oppress them.