4A 

The smartest, most fucked-up floor to ever grace the University of Wisconsin-Madison campus. Currently occupying the fourth floor of the A tower in Sellery 09-10, these students party harder on an average Thursday then you ever partied on your craziest night in college. Each weekend brings about new missing residents, new under-ages, new write-ups, and new injuries. On Wisconsin!

"Oh my god, did you, like, hear 4A blasting their music last night? It's, like, a Thursday night. Like, omg, wtf?"

"You, my friend, are the next winner of the 4A 'Most Fucked Uuup' Trophy - congratulations."

"Woke up this morning to find that all the toilets on 4A are covered in puke... so I took a shit on the floor."

"True Life: I Live on Sellery 4A."

4A by cooch kate February 25, 2010

4a 

This definition was spawned years back as a part of the 'acronym' culture in GB in the early 2010s. 4as stand for.

- An
- Anal
- Assbusting
- Activity

Or, 4a.

Person 1: Hi, man what do you think about Jenny?

Person 2: Imma keep it 100; Jenny is a 4a. If you feelin' me ;-)

Person 1: Bussin, lit!

4a by Dankzilla420blaze November 26, 2022

4A player 

A professional baseball player who has spent some time in Major League Baseball but is not quite good enough to remain there and often splits his playing in the major and minor leagues. Based on the minor league system of an A being added as you rise through each level of the minor leagues.

A player with a below .200 batting average in MLB might be a 4A player.

4A player by Okra Winfrey July 5, 2025

TI-99/4a 

An early home computer (which pre-dates the term "PC") release by Texas Instruments in June of 1981. The TI99/4A computer sold for $525, without a monitor. Specs included:

RAM: 256 bytes - Memory expansion card can be added : 4 KB or 32 KB (up to 52 KB)

ROM: 26 K

VRAM: 16K

Built in software: TI Basic

Processor: TMS9900

Clock: 3.3 MHz

Video:
NTSC: TMS9918A/TMS9928A, PAL/SECAM: TMS9929A, 256 x 192, 64 x 48, 32 x 24. 16 Colors available. Standard mode: 24 lines and 32 columns of 8x8 pixel characters, with 2 colors (foreground and backgroud) per group of 8 characters. Text mode: 24 lines and 40 columns of 8x6 pixel characters. Monochrome display: 2 colors (foreground, background) for all characters. No sprites. Multicolor mode: 48 lines and 64 coloumns of 4x4 boxes. Each box can have its own color. Graphic mode: 192 lines and 32 columns of 1x8 pixels "characters". Each character can have its own set of two colors. In addition, the VDP can handle up to 32 sprites. Each can have a color of its own (background is always transparent).

Color Palette: 16

Sound:
TMS 9919 Complex Sound Generator. The sound chip can emit simultaneously up to 3 tones and 1 noise (which can be a periodic or a white noise). The theoretical frequency range is from 28 Hz to 111 kHz and the volume can be adjusted on a scale of 0 to 15.

Interfaces:
1 x Cartridge, 1 x Expansion Port, 1 x Composite Monitor Out, 1 x Cassette Interface, 1 x Joystick (non Atari compatible)

Disk drive:
No built-in drive.

Power supply:
External

Many a programmer learned to write code on a TI-9/4a.

TI-99/4a by ogreesh April 27, 2005

ØVRE BAKKELANDET 4A

A place in Trondeheim just for the biggest dicks in town. Be careful when you walk past becasue you might get fucked. If that is something you wish upon yourself, please call the magic phone: [phone]

Girl 1: Do you know where to find an 18 inch cock?
Girl 2: Yes, just go to Øvre Bakkelandet 4A! theres plenty

Guy 1: She´s not joking, my ass still hurts form last year!

ØVRE BAKKELANDET 4A by Guy not from Øvre Bakkelandet November 19, 2022

Cashier_4A 

generic convince store cashier who doesn’t actually do his job. it’s often said is “sus.”

yo mama: “Hey, have you seen Cashier_4A recently?”
KKrimm: “Yeah, he told me he likes Deez Nuts.”

Cashier_4A by KKrimm June 17, 2021

4 A.M. Miracle 

An unexplainable and extraordinary even that happens around 4 a.m. where sleep deprivation erodes your internal censors and allows you to come out of yourself and create something amazing.

If it wasn't for that 4 A.M. miracle, I wouldn't have finished that paper in time for class.

4 A.M. Miracle by Alex LaFosta February 2, 2009