y u hek 

A term used to spam Maplestory forum threads such as those on Basilmarket. Frequently used when the poster has nothing better to say or randomly accuses the thread starter of hacking for a valid or invalid reason.

1. Joe: OMGz my Maplestory wont start all I get is black screen wtf!!1!1one

Bob: "y u hek?"

2. John: Private servers suck Nexon ban them pl0x

Bob: "y u hek?"

y u hek by John Doe Jr. May 23, 2008

y'ain't 

A contraction of the two terms y'all (you all) and ain't (are not), resulting in one word that means "you all are not."

"Y'ain't got shit on me, Tyrone."

y'ain't by QuantumOfSilence March 2, 2017

y in brackets

a way of describing something to be good, or to describe your mood. deriving from the MSN emoticon that is a thumbs up, the code being (Y), or y in brackets.
can also be used randomly by shouting it out and putting your thumbs up cheerfully.
often used by computer nerds or just general cool kids.

i got an A* in my test, y in brackets!

person 1 : how was the show?
person 2 : y in brackets, i loved it!

y in brackets by hannahhhhh. May 5, 2007

Y U MAD? 

A question asked after someone has expressed grief or anger to further piss them off more.

Person 1: God I am so pissed off right now. This damn thing doesn't work right!
Troll: Y U MAD?
Person 1: FUUUUUUUUUUUUUUU!!!!

Y U MAD? by ChillBilly75 December 19, 2011

y'all don't know me 

A way one can dismiss concerns and/or animosity others have towards them. Can refer to practically anything, but usually is reserved for illicit or illegal things.

Moneesha: "I'ma have sex with whoeva I want! It don' even matta!"
Tyra & Monique, Moneesha's Friends: "You need to stop Moneesha! You're going to end up dead or with a disease. We're really worried about you."
Moneesha: *waiving hands and pointing fingers* "Whateva! Whateva! Y'all don' know me! Y'all don' know me!"

y'all don't know me by ACG2x September 29, 2004

y-y1=m(x-x1) 

It's the Point-Line Slope formula.

Formula: y-y1=m(x-x1)

y-2=3(x-1)
y-2=3(x)+3(1)
y-2=3x-3
y=3x-1

y-y1=m(x-x1) by Iamweasle November 18, 2009

y tho 

"Y tho" is a term used regularly nowadays. Stemming off of the phrase "why, though" it has been recently used to show confusion in a trolling type of manner. If, say, someone does/says something unintelligent, it is appropriate to reply with "y tho". For people not to confuse "y tho" with "why, though", squint your eyes while protruding your neck and calmly, in a small voice say "y tho?".
(Also there is a meme associating with this phrase.)

Person 1: Honestly, y'all are just vapid, y'all should leave.
Person 2: y tho?

y tho by Kim Taehyung's bear June 13, 2018