It has no real definition, but it's derogatory and can describe a skank or someone that your friend has already fucked, sloppy seconds.
Greg: Hey Tom, how are you? I was thinking, I sure wouldn't mind if you fucked my ex-girlfriend Vicki.
Tom: No way! Do you think that I would fuck that piece of slunkmeat?
Tom: No way! Do you think that I would fuck that piece of slunkmeat?
by Tom January 30, 2004
by Donnie Larko February 28, 2017