Ferocious is the new fierce of course. The gay community monopolized the usage of the word fierce to describe all things exceptionally fashionable, "cunty", attractive, cutting edge, fantastic, eye-opening and attention worthy. Ferocious is the new and updated version of fierce. Its harder and edgier. Wonderful. Beyond expectation
Ex.1: Did you just see the way she walked into the party with her stiletto heels and kicked her scumbag cheatingBF to the curb in front of everyone? she's ferocious.
Ex. 2: What do you mean you scored us comped front row seats to the Madonna concert? You're ferocious.