Ronversation 

An utterly pointless and awkward conversation that draws on for a intolerably long time. Usually with someone who, despite your best efforts, does not realize you do not want to talk to them.

Man, that just went on and on. He was just insisting on having a ronversation with me.

Ronversation by Rabidmogwai March 6, 2009

conversation piece 

any type of decoration or accessory that sparks interest or curiousity among first-time onlookers.

Often they will ask questions regarding its origin, how you acquired it...etc. , thus leading to a conversation.

"I don't know how you got that Model T Ford in your living room, but I gotta say it does make an intersting conversation piece!"

conversation piece by polo September 6, 2004

conversation hijacker 

One who jumps into a conversation un-invited, often for attention.

George: "Hey, you see the game last night?"
Justin:"Yea, it was-
Kyle:"I LOVE FOOTBALL!"

Kyle is a conversation hijacker.

conversation hijacker by Georgey A. March 16, 2008

Biscuits and stimulating conversation 

Commonly known from a Harry Potter fanfiction, Potter, this means doing the frick frack, or sex.

"I spent my Christmas having biscuits and stimulating conversation."

Biscuits and stimulating conversation by JaimiePotter December 28, 2019

robust conversation 

Rich Lobbyist code speak for "Take this money and do what I say."

We do look forward to having more robust conversations about this. We would like to have more robust conversations about this.

robust conversation by The Dark Knight of Legends February 10, 2020

nonversation 

A completely worthless conversation, wherein nothing is illuminated, explained or otherwise elaborated upon. Typically occurs at parties, bars or other events where meaningful conversation is nearly impossible.

Smith: What a waste of time it is talking to that guy.

Jones: I know, every time I do, it's like a complete nonversation.

nonversation by wordsbywilson March 12, 2009

private conversation 

oral sex, whether it be consensual or not ei: "a conversation with his/her privates"

1) often used in euphemism to ask if someone would like to give you for oral sex.

2) alternatively, a covert way to inform someone that you are quite displeased with someone and would like to shove your privates into their face

1) It's kindof crowded in here... you wanna go someplace else for a private conversation?

2) Nick: What are you guys whispering back there? Is it a private conversation?
Joe: How 'bout I come up there and shove my balls in your face? Then it'll be a private conversation!!

private conversation by boosh chugger May 5, 2009