Conversation Condom 

A phrase used to hide details, or save yourself from saying something you dont really want someone to know.

Person 1: "What did you say when Cindy asked you what you did last night?"

Person 2: "I just used one of those conversation condoms and changed the subject."

Conversation Condom by Doug Cota August 6, 2008

Conversational Condom 

The person on the phone being asked to pass messages to a person next to them, thereby preventing the two other people speaking directly.

and tell Amber I said Hello.

Tell her yourself, she's right here and I'm no conversational condom

Conversational Condom by Thantheman November 14, 2010