Kim Kardashian (who else?) led the way for the freakish application of various shades of make up that looked like you had been attacked by a child face painter. The results of the application were perfectly flawless looking make up. That's contouring. It enhances bone structure apparently and girls the world over have since incorporated it into their daily make up routine.
Not I however, I'm useless at it and just too lazy to try really.
Cosmopolitan gave four men a contouring diagram and some make up and sent them on their merry way to contouring heaven. The results could have been a lot worse in fairness.