“Titane” is the French term for “titanium,” one of the strongest metals on Earth.
With that in consideration, the title “Titane” makes sense, as metal and strength are often tied to masculinity, which plays a major role in this feature.
The main character of the movie is Alexia (Agathe Rousselle), a young woman who works as an exotic dancer at a car show. Alexia seems mostly closed off, and has been so since she was a young girl, when a serious car accident resulted in her needing metal plates inserted.
As the first act reveals, though, Alexia has a dark hobby outside of her main dancing, job. This aspect of her life, as well as a sexual encounter she has one night after work, forces her to make a major change in her life, to the point where she has to assume a different identity. However, this action only leads to more complications.