Ey dude, you hungry? Yeah, lets hit the slut buffet.
A chick who you know does anything sexual to all of her guy "friends" any time she goes out to "the movies" with them.
A chick who will turn tricks (any trick) for money. After all, you do have to pay for a buffet.
Jack: "She's a total slut buffet."
Joe: "I heard that Lisa will do whatever a guy wants her to for a low price."
Mark: "What a slut buffet."