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prelashing 

(VERB) To consume alcohol, generally a large amount, at one's own place of residence or that of a friend, as a precursor to going out to a party, bar or club. Also 'prelash'(NOUN). Can be practised alone or in groups. Often performed at the same time as getting changed, putting on make up or straightening hair. Favourite pastime of students. Can involve drinking games such as 'Ring of Fire.' Generally considered to be a cheap, convenient alternative to drinking in bars before clubs open.
'Are we prelashing at Dave's tonight or just going straight to the bar?'
prelashing by madameW January 22, 2008
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preaching to the choir

Preaching to the choir means you are trying to make believers out of people who already believe, or convince people who are already convinced.
"We could start a new tradition, Birthdays without Boyfriends. It could work."
"Preachin' to the choir here baby."
preaching to the choir by Kay May 15, 2004

Preathing 

Preath in its verb form. Can be used when speaking of any action American footballers Tobin Heath and Christen Press did or currently do together, though there is usually a suggestive connotation. They could be standing next to each other simply breathing, but Preath fans would say that they are Preathing.
"Look at Tobin and Christen over there. They're totally Preathing out!"
"The November camp gives them many opportunities for Preathing."
"Look! They're eating at the same restaurant! They're Preathing!"
"When Tobin and Christen are Preathing, it's bittersweet because on one hand I'm like 'aww' and on the other hand I wish I had someone like that."

Preaching to the Choir

Spending time trying to convince people who are already behind you.
HR won't hire this guy. They want someone who can "hit the ground running". They must be waiting on a "purple unicorn". I apologize, I'm "preaching to the choir". (LOL. That was 3 metaphors in one explanation. I recommend using Urban Dictionary to look of the other two metaphors)

facebook preaching 

When someone does something on facebook and thinks it makes a difference in the environment, the life of a child, etc and starts to get all preachy about it.
"Save the whales. Totally. you can do it without leaving your living room"

-Man, stop your facebook preaching.

Preflushing 

To flush the toilet first in order to drown the sound of your farts and diarrhea. People who preflush usually shit during the flushing noises.
1. The dude in the stall next to mine was preflushing so that people wouldn't hear his violent diarrhea.

2. I had to preflush right before I let out a loud fart while taking a dump.
Preflushing by JayZed April 28, 2010

preaching to the Buddha 

trying to teach someone something they already know
"If you want to ride an elephant, you have to embrace the beast inside you"
"You're preaching to the Buddha, man, I've done this a million times"
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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.
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Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
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"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
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korean word for madam, older woman
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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