The art of receiving oral copulation when situated in a mosh, or a large and unruly crowd of individuals. The moshjob is considered such a rarity due to the subtlelty required to perform such an act.
Example 1:
Guy 1: How was last night's Justin Bieber concert?
Guy 2: Awesome, I received a moshjob in the mosh.
Guy 1: You are so lucky I wish I could be you.
Example 2:
Girl 1: Hey, why are you bleeding so violently from the nose.
Girl 2: I was giving a moshjob at the Rage Against The Machine concert 5 minutes ago and I kept getting kneed in the face.
Girl 1: That's terrible I'm glad I'm not you.