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mouthassjackery 

1. Talking about something or someone in a positive light, when in reality, the words coming out of your mouth are pure fiction.

2. Talking about something you don't know anything about while trying to present the illusion you are educated on the subject.

3. The act of saying absolutely ridiculous shit.
example 1:
Joe: George Bush was the best president the United States ever had!

Jack: Imma punch you in your dumb face if you don't stop that mouthassjackery.

example 2:
Vince Offer for the SlapChop:
... This thing, this tuna looks boring. Stop having a boring tuna, stop having a boring life. Add this tuna putting it in like this now you’re going to have a nice, tuna, salad. Look at this you’re gonna have an exciting life now.

TV Viewer: LOL - good ole' Vince ... He is the master of mouthassjackery.
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British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
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or, in a positive usage:

"Booya! That freestyle was dutty!"
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Ajumma wait a moment
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Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
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Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
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