adj. Hot; sponge-worthy; boink-worthy; fuckable; tie-to-the-bedable; conjugalicious.
Real citation: "My poor keelhauled heart is a tattered vessel now. He used to crack wise about her thick ankles, smiling like a leopard. But watching his eyes poodle after her Manolo Blahniks on that Milan runway, I knew he still found her only too mattressable."
(Rob McClure Smith, "Masonry," http://news.scotsman.com/topics.cfm?tid=1038&id=624012004)
Made-up citation: "I don't feel very mattressable these days, but I'm still park-benchable, ladies!"