This is pretty funny - particularly the British definition referenced:

CBSNEWS Chief White House correspondent John Roberts described the President’s selection of Judge Samuel Alito as “sloppy seconds” during today’s press gaggle with White House Press Secretary Scott McClellan.

John Roberts: “So, Scott, you said that -- or the President said, repeatedly, that Harriet Miers was the best person for the job. So does that mean that Alito is sloppy seconds, or what?”

Scott McClellan: “Not at all, John.”

Sloppy seconds” is described in the United Kingdom’s A Dictionary of Slang as:

Noun: “A subsequent indulgence in an activity by a second person involving an exchange of bodily fluids. This may involve the sharing of drink, or more often it applies to a sexual nature. E.g. ‘I’m not having sloppy seconds, I want to shag her first.’”