The practice of stealthily avoiding buying your round of beer at the pub.

Waiting until others are so drunk that they don't notice you never bought a round of pints during the evening.
Eoin: "Who's round is it?"
Pete: "I bought two rounds of 7 pints already tonight".
Eoin: "Me too, Steve how many rounds did you buy?"
Steve: "Oh ho, I bought the last round"
Paul: "No you didn't, you ordered it but I payed for it!"
Eoin: "Steve, you've been merning again!"
by TexanJoe July 10, 2010
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A word sometimes said as a filler and/ or conversation ender because noone know what d'fuq it means.

As a filler it can be used when you either have nothing else to add, do not wish to say anything more, or when you do not wish to state the the obvious.

Also quite useful as a conversation ender when you're talking with someone unfamiliar or simply undesireable.
as fill:
person 1: Yeah I like that band even though you hate them, you just don't have to come to the concert with me

you: Mern.

person 1: Alright then, I'll go with suzie.

(You in this situation are upset by the fact that this person is rubbing it in that you hate their shitty style of music so you wish not to say anything stupid in place of mern ie.: "you are an idiot for liking that" or state the obvious: "Yeah, I don't like that shit". However this situation is also unique in that you also have nothing else to add, this person knows you don't like it and thats been said, you don't even like concerts and they know it, changing the subject is inappropriate here, so you have no choice, but to use "mern".

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as a conversation ender:

person: Hey, havn't seen you in a while, it's like you disappeared. You've been like ignoring my texts and stuff.

you: Yeah, well mern.

person:.....

(obvously the person in this example is undesireable because they use phrases such as "like" and "and stuff" also clearly you are ignoring them probably because of their social ineptitude or a variety of reasons. Notice how there is no reaction from the person because they are unaware how to proceed after such a statement. As they are both confused by the meaning and use of mern they have no response.)
by Niffle May 1, 2013
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"Me right now" (also 'me rn') used in conjunction with a picture, gif, or video of an expression, activity, etc. that mimics what you are currently doing, feeling, etc.
Samantha: I'm so tired. I just had sex.
Samantha: D:
Josh: Mern ^ D:
by Zrizt October 5, 2017
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The combination or "stack" of web technologies to make a web application using the following: MongoDB, Express, Redux/React, Node.js
The MERN stack helps us put together responsive and smart applications quickly and can scale nicely even to handle lots of traffic. It caught popularity after the MEAN stack which differs only in that it uses Angular instead of React.
by Pizzas1337 February 22, 2019
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(n) southern way of saying man
hey, what u doing, mern?
by redneck billybob August 17, 2003
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Human being. One who is inherently dull, ineptly dressed, unknowingly bland. Tasteless in art and pop culture. Thinks they are cool, but are in actuality no where near socially acceptable.

My date was a total mern; pleated khakis, bad shoes, and to think he thought he was awesome.
by AP & JA August 10, 2006
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sexy ass mama with the juiciest cheeks on the whole block. she'll give sloppy lick to any dog who gives her a bone. the only downside to this flawless specimen of middle aged mom is she fricks her own sons.
"bro, did you see that hot ass chick?"
"hell yeah, i clapped her, she's a real mern fairy.'
by hibblygibbly February 12, 2018
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