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It's using when someone give an advice or his opinion about something he doesn't know anything about it or he has no idea what is he talking about
Does he know what is this book talking about?. No he is just byfsy.
byfsy by Zozombi February 20, 2021
Urban Dictionary Merch

Byfsismcdab 

Byfsismcdab is the short form of "Bitch you fucking stupid idiot suck my cock dumbass bitch", it is the highest form of insult possible, use it on someone while aruing to get the upper hand.
Dude 1: Uh Hu? WELL UR MOM IS FAT

Dude 2: Ok and?

Dude 1: NO ONE ASKED NOOB

Dude 2: Shut up Byfsismcdab

Dude 1: OMG UR SO SMART IM SO DUMB I HAVE NO IDEA WHAT TO SAY BACK TO THAT
*Dude 1 Has Left The Chat*
Byfsismcdab by VvgoproZ March 6, 2023
Related Words
By Youth For Youth; noun. Refers to a church body made up of people ages 14-25 who run everything -- from ground-breaking original music, to speaking, to moving in the Holy Spirit -- themselves with fire and passion for growing the Kingdom of God, and there's no holding back!
www.byfychurch.com check it out -- Atl.
Church - it isn't just for old people anymore.
byfy by Rachelc3atl March 3, 2008
bye,see you. I love this acronym.
me and my friends often use this word when saying goodbye
pronounce: (byesee)

we usually speak by adding meaningless sounds to the end of words. so we found
x:I'm going to meet my girlfriend, we'll talk later.
y: okay bro,bysy
x: bysy
bysy by Ahmosx January 25, 2022

Bysyn Bhicken Buggets 

Bysyn is a new sexuality.

Being a Bysyn Bhicken Buggets means that you are self producing, and only reproduces with themself on a friday night eating chicken nuggets. This sexuality only exists in Minnesota, and it wishes to be called "zhe" or "sklurm" or "splooge". Only 0.001% of the population has this. Incredible that I could meet this person!
hey bro, be honest with me... Are you a Bysyn Bhicken Buggets?

yeah bro...

It's okay. This is 2019. We accept you fam.
More from Urban Dictionary

You met me at a very Chinese time in my life

A moment in time where you feel distinctly Chinese over all other things.
Dante: "I wish I could be Nigerian, but I can't because I'm Chinese. You met me at a very Chinese time in my life."
Word of the Day on September 25, 2026
Adjective. Used to describe persons who have adjusted or altered their lifestyle for environmental reasons. Crunchy persons tend to be politically strongly left-leaning and may be additionally but not exclusively categorized as vegetarians, vegans, eco-tarians, conservationists, environmentalists, neo-hippies, tree huggers, nature enthusiasts, etc.

Also used to describe establishments where alternative foods and products are sold, i.e. natural food stores.

Modified derivative of granola.
"I need more crunchy guys in my life. I'm so tired of dating preppy metrosexual assholes."

"I'm heading out to the crunchy store to pick up some fair trade chocolate and tea tree oil, do you need anything?"
crunchy by EBC July 11, 2007
Word of the Day on September 24, 2026
A group of people, typically women, searching through someone’s digital footprint in order to find more information about that person.
Susie wasn’t sure if her new Hinge match was a creep, so she assembled Galantir and they found out he used to post slurs on gaming forums.
Galantir by Ge-sus September 22, 2026
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murderhobo 

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The term is most common with Dungeons and Dragons, but it can be applied to most RPGs where the player is allowed to kill most quest-giving NPCs and NPC traders. E.g. Elder Scrolls, Fallout, Divinity original sin.
DM: The sad little orphan girl tugs at Steve's trenchcoat to get his attention, and ask for help saving her pet dog from...
Steve: I'd like to roll a strength check against strangling the orphan.
Dave: I call dibs on the dog.
DM: You murderhobos disgust me.
murderhobo by Loup&S September 9, 2021
Word of the Day on September 22, 2026
In sales terms, a whale is a prospect that is significantly larger than an organization’s average customer.

Whales are large and extremely difficult to close. Due to their immense size, they are highly sought-after.

A whale is typically identified at first by a whale hunter on the sales team, but often requires cross-discipline participation in order to close; this includes assistance from operations, engineering, creative, client success, and business development teams.
"Shit...the sales director chewed me out on the sales call this morning. He's totally pissed that I have nothing in my pipeline. I've been focused on this one whale for so long that I haven't had time to prospect for normal-sized deals."
Whale by FQ_GFY February 3, 2020
Word of the Day on September 21, 2026

Concrete cowboy 

A guy who thinks he's a country kinda guy, but in reality lives a comfortable city / suburban life.
Eugene: Look at that dude in the cowboy hat!
Todd: He's just a concrete cowboy.
Word of the Day on September 20, 2026
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