The woman that your man is cheating on you with. She's usually more of a freak in bed and will do things his wifey won't do.
by Katrina November 16, 2004

Lars Ulrich of Metallica.
by Katrina December 03, 2003

stands for multiple shagging disorder!When a person feels the need to have sex with several people every week!
Bloke: So doc what have I got
Doc: I'm afraid to say you have m.s.d and i'm sorry but it's incurable I will prescribe you some condoms
Doc: I'm afraid to say you have m.s.d and i'm sorry but it's incurable I will prescribe you some condoms
by katrina January 11, 2005

by katrina January 17, 2005

A great bass player and was in Metallica. He sadly died in September 1986 in a bus crash, while sleeping in his bunk on tour. His last album was "Master of Puppets".
by Katrina December 24, 2003

