The act of dancing like a loon behind unsuspecting Colleagues, friends, or school mates and not getting caught. Best done when extremely bored. Remember, its only stealth if you dont get caught, but catch it on film and post it on the net, because i think its funny.
John did the best stealth disco behind Mary, she had no idea, we got it all on film.
While John was sleeping on the couch, Mary did a stealth disco in front of him, he didnt wake up