A situation when a young gentleman or teenager is in search to ask out a specific girl in mind out on date, a special event, etc. Asking out the girl requires planning, thought, timing, and above all: balls. This in its entirety is the mission. For the males, it is a risk asking out that girl because experiencing a rejection can be a very humbling experience for the male ("Dammit" by Blink182 describes this). However, if the girl says no, the mission is not over or failed - the mission can only be accomplished that is when the first girl says yes.
Dude 1: "Hey! Did you here he's gonna ask her to prom today!?"
Dude2: " Yeah, he's a man on a mission. As a bro, I wished him luck."
Bro 1: "Oh snap! Did he just get rejected?" Bro 2: "No... he's a on a mission, and it has just begun.