dead ringer 

1. a person or thing that looks exactly like anther person or thing

2. an exact duplicate

That bear is a dead ringer of the one that was found in the pool.

dead ringer by The Return of Light Joker February 17, 2009

Tit caught in the ringer

Any situation,activity or behaviour that is exposed when wished not to be.---from the old days when washing machines did have ringers and getting you tit caught in it was a possibility!

She thought she would cheet on the test, but she got her tit caught in the ringer!

Tit caught in the ringer by vernon dutton January 20, 2004

John Ringer 

Similar to a Bellwether, a John Ringer refers to a leading indicator of some sort of change, similar to "canary in a coal mine". Unknown origin, has been used as a common phrase in corporate conference call settings at least going back to the late 90's.

As you can see here on this chart, the strong sales numbers act as a great John Ringer indicating healthy growth.

John Ringer by hackysackman February 18, 2021

dong ringer 

One who only gives hand jobs no matter how many dates you go on.

25 dates and she still only gives me a hand job; she’s such a dong ringer.

dong ringer by Majickcom1 July 13, 2021

Is yo ringer on? 

Meaning to be on it game, to be on point. Be alert pay attention. Be on ur shit. Don't miss anything.

Homie 1: yo are we gonna go make this deal?

Homie 2: yeah let's do this.
Homie 1: is yo ringer on?
Homie 2: yes let's make sure we all got out ringer on tonight

Is yo ringer on? by StiNA TrASh WhITe October 3, 2016

bowl ringer 

An enormous turd that snakes all the way around the bowl.

Oh my god Nick, that bowl ringer wrapped around 3 times!

bowl ringer by Excaliber April 14, 2005

A double ringer 

A poop that goes around the toilet two times.

"Yo jon i just did a double ringer"

"Whoa no shit!"

A double ringer by wiggywig November 19, 2011