"Secret Diplomatic Negotiations" is a comical euphemism for anal sex. It was coined over at
www.apennyforlenny.com, based on a Jeopardy clue.
The clue was from the category "BACK" TO SCHOOL. It was:
“SECRET DIPLOMATIC NEGOTIATIONS ARE
SAID TO
GO THROUGH THIS”
The answer was "WHAT IS THE BACKDOOR?"
"Could I interest any of you ladies in some Secret Diplomatic Negotiations?"
"Yeah, me and
Becky Diplomatically Negotiated in Secret all night
long."
"If you're ever in
prison, watch out for the Secret Diplomatic Negotiations that happen in the shower."