1. Self-confidence, Self-assuredness. As in basis for belief in ones self in a situation. Esp. I context of contest or display of skill such as sexual advances or going into battle.
2. Good luck fetish / charm to bolster confidence.
3. ability to bounce back from a debilitating trauma and negative attitude
He got his mojo back now.
Mojo will make one seem and feel sexy, virile, appealing, invincible and in control etc.
Alcohol or love usually awakes the mojo.
When ones mojo is working, it often results in flirting and heavy socializing with the opposite sex (or whatever prefered).