Liar In Chief 

Nickname for a head of government whose statements regularly have such tenuous links with reality that he/she is not taken seriously by others, except, perhaps by such people as are earning a living by trying to explain away the lies of their employer.

The press secretary is struggling to make credible the words of his liar in chief.

Liar In Chief by Wryface March 20, 2017

Liar's Paradox 

The paradox that is created when someone tells you that he or she is a liar. If he IS a liar and tells you that he is a liar, then he is telling the truth and can't be a liar. If he is NOT a liar, but tells you that he is a liar, then he is telling you a lie, so he must be a liar.

"Hey George! Don't believe a word I say!"
"Man, that's fucked up big time. If I believe what you are saying now, it means I must not believe you, and if I don't believe you, it means I have to believe you! It's the Liar's Paradox!"

Liar's Paradox by Stefano Amare October 18, 2013

Liar’s Dividend 

The Liar’s Dividend is a phenomenon where someone can get away with lying by saying that something is “fake news” and if the media attempts to expose the lie it can backfire and only make the lie sound / seem even more credible.

They believed his lies because of a phenomenon called the Liar’s Dividend.

Liar’s Dividend by Micstusmi September 8, 2020

Liar Pig 

A person who lies a lot

"Dave you're such a liar pig!"

Liar Pig by liarpig3 April 8, 2009

Liar Liar, Plants for Hire 

A thing Patrick Star said instead of "Liar Liar, Pants on Fire" in an episode of Spongebob Squarepants when Patrick ate a candy bar then thought he'd lost it, then blamed it on Spongebob and said the line.

Patrick: Liar Liar, Plants for Hire
Spongebob: It's pants on fire Patrick
Patrick: Well you would know, liar

Liar Liar, Plants for Hire by UrbanlyDictionistic October 28, 2021

Liar Liar Pants On Fire 

Liar Liar Pants On Fire is a phrase that children like to scream at each other whenever they think the other is lying. They also like to scream it at adults who tell them stories about fairies. It is an overall stupid thing to say, since if your pants actually caught on fire when you lied, more politicians would be dead.

Kid: Liar Liar Pants On Fire!
Adult: Shut the fuck up.
Kid: *cries*

Liar Liar Pants On Fire by Adam Cecil June 1, 2006

Liar Liar Pants On Fire 

"Liar Liar Pants On Fire" is a playground taunt that is used to indicate each other whenever they think the other is lying.

It refers to the fact "fibbing" is consider naughty, and pants/bottom 'on fire' is an euphemism for spanking.

Child1: Well my dad can pick up a truck!
Child1: Liar Liar Pants On Fire!

Liar Liar Pants On Fire by Roguebfl April 14, 2009