Stepping Razor Meaning

(idiomatic) A dangerous person, who is not to be messed with.

Example: 1984. William Gibson, Neuromancer (novel):
  (The inhabitants of Zion refer to Molly as Steppin' Razor)
1977. Peter Tosh, Stepping Razor (album and song):
  I'm like a stepping razor
  Don't you watch my size
  I'm dangerous, dangerous.