Holding another job at night, often one of a sketchy nature.
Maybe if Jane didn't wear such slutty clothing, people wouldn't believe that she was moonlighting as a stripper.
de Victoria 14 février 2005
To work a second job usually during the moonlit hours.
"I hear that John has been moonlighting every Monday evening"
de LaylaRose 12 septembre 2011
Picking up while already pinned.
Lady sleeps with man in a hotel, he falls asleep, she comes downstairs and picks up another (this is the part referred to as Moon lighting), sleeps with him and then goes back to the original.
de Lallie Wade 6 septembre 2008
Seeing someone else on the side while you're in a long-term relationship.
I was moonlighting with Dave during the first six months that I was seeing Greg.
de don'tWaitUp 5 juin 2010