A silent slut is a person who secretly gets around, and everyone knows it but never says anything. Most often guys, or well liked girls.
Girl1: I think Jamie likes me.
Girl2: No sweetie, he's a silent slut. He was with Krista 2 nights ago.
Girl2: No sweetie, he's a silent slut. He was with Krista 2 nights ago.
by SHWANGG September 1, 2006
by KoolAidFrog September 22, 2015