• A11Y: a11y, it's too long to type. https://www.techopedia.com/definition/10165/accessibility-a11y
• A8C: Automattic, many people think that is the one that owns WordPress.
• AFAIK: As Far As I Know. "I know nothing but take this as an undeniable truth and good luck"
• AFK: Away From Keyboard. Use it whenever you don't have an valid excuse to stop working and have a drinky.
• APAC: Asia Pacific Region.
• BBIAB: Be Back In a Bit. Probably more than "a bit".
• BIAB: Be Back In a Bit. Why the hell do we have two for the same thing?!
• BRB: Be Right Back. It's more "I will be right back" but I don't know why English speakers omit the first two letters. It should be IWBRB but whatever.
• BTW: By The Way. Said when you want to talk about a completely different topic and confuse people.
• EMEA: Europe, Middle East and Africa regions. Best area, because I am in it.
• FFS: For Fuck Sake!
• FML: Fuck My Life. Say this whenever webpack doesn't work after 3 hours of debugging.
• FTW: For The Win. Used in a sarcastic way sounds much better.
• FWIW: For What It's Worth. When you provide completely useless information to somebody.
• HM: Human Made, a japanese clothing brand: https://humanmade.jp/. Visit it! They are great!
• IANAL: Phew! This one almost sounds really bad, eh? But no, it's "I am not a lawyer", when you talk about legal stuff but you, OFC, don't have a clue of what you're saying.
• ICYMI: In Case You Missed It. Pay attention!
• I18N: i18n, I don't have time to write it all. https://whatis.techtarget.com/definition/internationalization-I18N
• IIRC: If I Recall Correctly. Said when you don't have idea of what you're talking about.
• IKR: I know, right? Keep your ego high.
• IMO: In My Opinion. Said when someone is scared of its own opinion.
• IMHO: In My Honest/Humble Opinion. When saying an opinion is even scarier.
• IMNSHO: In My NOT So Honest/Humble Opinion. No fears at all.
• L6N: Location. Use it if you are extremely lazy when typing.
• LOL: hahaha. Laughing Out Loud while you keep your face completely serious in front of your screen.
• MSA: Master Services Agreement - a huge lump of legal contract with terms and conditions - usually signed every couple of years after a lot of arguments and then never looked at again. dixit @meeware.
• OFC: Of course!
• OMFG: Same than OMG but insert an extra Fucking in the middle.
• OMG: Seriously, you don't know this one?
• OMFGBBQ: They told me it was OMFG + Barbecue. ¯\_(ツ)_/¯
• OOO: Out Of Office.
• PO: Product Owner. Its' like Edgar Allan Poe without the Edgar, Allan, neither the 'e' at the end.
• POC: Proof Of Concept. When you start a project in a quick way, with no real testing at all, non-legible code written fast until it becomes a real project and is too late to fix all that garbage.
• POC: People Of Colour.
• RIP: Rest In Peace. Those are bad news, normally.
• ROFL: hahahahahahahahahahhahahahahahahahahahhahhahhahahahahhaahahahahaahhahaahahaha. Rolling On Floor Laughing while you keep your face completely serious in front of your screen.
• ROFLMAO: Rolling on the floor laughing my ass off (it's a lie)
• SOZ: Sorry when you are uneager to say sorry.
• STFU: Shut The Fuck Up. Not used too often in Slack but probably thought very often.
• SoW: It's not a saw, it's just a Statement of Work. Copied and pasted from some random site: Detailed description of the specific services or tasks a contractor is required to perform under a contract. SOW is usually incorporated in a contract, indirectly by reference or directly as an attachment.
• UK: A nearly-used-to-be-european country.
• WC: WordCamp. Where people that do WordPress talk about WordPress all the time. Example: "Excuse me, where is the WC in this WC venue?"
• WCEU: WordCamp Europe. Same thing but with more people from Europe and many other countries outside Europe, if that makes sense.
• WCUS: WordCamp USA. I should probably be named as WC America but I don't know who is in charge of that.
• WP: Wordpress but with capital P, dangit!
• YMMV: Your Mileage May Vary. It worked for me but probably won't for you.

This repo is open for contributions. Just open a PR if you wish.

Note: WTF has been requested several times as an addition. We are sorry but we don't accept WTF as we consider it as plugin territory.