The most common British slang terms for lying are "fibbing" or "porkies". These are used across the whole of Britain by multiple generations and are all but universally understood. Some archaisms like "flam" are still used to some degree.
Porkies – if you are accused of telling a “porkie” it's serious. It means someone thinks you are lying. The saying comes from an old Cockney rhyme that used pork pies and substituted “pies,” for “lies” and it later got shortened to “porkies”.
In modern-day usage, "cap" is often used as a verb or an adjective to describe something as fake or dishonest. For example, someone might say "He's capping" to mean "He's lying" or "That story is cap" to mean "That story is fake". Conversely, "no cap" is used to indicate that someone is being truthful or sincere.
Babe Ruth is Cockney slang for Truth.
The most common British slang terms for yes are common words like “yep” or “totally”. More regional slang terms include “aye” which you'll mostly hear in Scotland and parts of the north of England. Other than that, you will hear universal slang terms like “completely” or “for sure” used for yes by the British.
Hunky-dory: Use this to describe when something is OK, cool, normal or "all good." ("Everything is hunky-dory over here!")
"Appears suddenly about 1575, and is exceedingly common about 1600." Probably from use of aye (“ever, always”) as expression of agreement or affirmation, or from Middle English a ye (“oh yes”), or synthesis of both.
"Smarmy" Someone that comes across as scheming or untrustworthy might be described as "smarmy." Although the adjective's origins remain largely unknown, early documented uses seem to use the word as synonymous with "smear," further suggesting that someone who is "smarmy" is also "slick" or "slippery."
A good example of this is the famous Cockney slang for 'wrong': Pete Tong – 'wrong': “It's all gone Pete Tong!” Cockney rhyming slang is fun to learn, an interesting new way to discover new words, and a way to expand your knowledge of British popular culture.
Mug/Daft
This one is used to refer to someone who is a fool, while Daft means some behaviour or action is foolish or stupid.
Some common synonyms of lie are equivocate, fib, palter, and prevaricate. While all these words mean "to tell an untruth," lie is the blunt term, imputing dishonesty. lied about where he had been.
"speak falsely, tell an untruth for the purpose of misleading," Middle English lien, from Old English legan, ligan, earlier leogan "deceive, belie, betray" (class II strong verb; past tense leag, past participle logen), from Proto-Germanic *leuganan (source also of Old Norse ljuga, Danish lyve, Old Frisian liaga, Old ...
Break 'lie' down into sounds: [LY] - say it out loud and exaggerate the sounds until you can consistently produce them.
You'll hear this one a lot on the British Love Island. Another great British insult. A “muppet” is a person who is ignorant and is generally a bit clueless. In the UK, “pants” typically refers to underwear.
'Tinmanning', 'straycations' and 'stealing home' are among the most common terms used by cheaters to hide affairs from their partners, new research reveals.
Mug. If you are a bit of a mug then you are gullible, and will believe anything.
Dodgy. When something's questionable for suspicious, we call it dodgy. It's a funky throwback to 1990s street slang and just fun to say.
Ay can be used to ask questions “What do you think of that, ay?” Confirm agreement “Totally agree, ay.” Even symbolize confusion “I'm not sure, ay.”
Hunky-dory – normal, fine, cool. Posh – Another well-known term that extends past the borders Great Britain, posh means something that is fancy. Proper – Sure, it can mean something that is not inappropriate, but it also means very.
Break 'Alright' down into sounds: [AWL] + [RYT] - say it out loud and exaggerate the sounds until you can consistently produce them. Record yourself saying 'Alright' in full sentences, then watch yourself and listen. You'll be able to mark your mistakes quite easily.
Brit. Brit is a commonly used term in the United States, the Republic of Ireland and elsewhere, shortened from "Briton" or "Britisher".
a person who deliberately gives false testimony. fabricator, fibber, storyteller. someone who tells lies. type of: beguiler, cheat, cheater, deceiver, slicker, trickster.