Jargonish
  • Browse
  • Generator
  • Translator
  • About
Log InSign Up
  1. Home
  2. Browse
  3. Gen-Z / Internet Slang
  4. FOS

FOS

Beginner 📱 Gen-Z / Internet Slang

Definition

Someone who thinks you're FOS thinks you're "full of s***." This acronym is used to call out people who are lying or ignorant.

Origin

slang.net

Related Terms

Advanced

hudge party

The absolutely euphoric celebration that follows an improbable come-from-behind victory in high-stakes gambling, especially poker. It's what happens when you go from broke to loaded in a single, miraculous winning streak.

📱 Gen-Z / Internet Slang
Beginner

ftsio

f**k this s**t I'm out

📱 Gen-Z / Internet Slang
Beginner

pimfa

pain in my f**king ass

📱 Gen-Z / Internet Slang
Beginner

snap!

An early 2000s exclamation expressing shock, amusement, or schadenfreude at someone else's misfortune or a sick burn. The verbal equivalent of the finger-snap emoji before emojis existed. Often elongated to "Oh, snap!" for maximum dramatic effect when witnessing someone getting roasted.

📱 Gen-Z / Internet Slang
Beginner

ttbomk

to the best o fmy knowledge

📱 Gen-Z / Internet Slang
Beginner

book it

To evacuate a location with extreme urgency and speed, usually because something bad is about to go down. Born from the idea of 'booking' or moving fast, it's the universal signal that it's time to make yourself scarce. Perfect for when authority figures appear or awkward situations arise.

📱 Gen-Z / Internet Slang

Translate This Term

See “FOS” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.

Try the Translator

Share This Term

Post on XShare on FacebookShare on LinkedIn

Discover a Term

Beginner

STFD

You will most likely see STFD in arguments in texts and online in messages and forums. However, remember that STFD is in...

Jargonish.com

All the words. None of the clarity. Your one-stop shop for jargon definitions, generation, and translation.

Explore
  • Browse Terms
  • Generator
  • Translator
  • About
Categories
  • Corporate / Business
  • Tech / IT
  • Marketing / Advertising
  • Finance / Accounting
  • Legal
More
  • Contact
  • Privacy Policy
  • Terms of Service
  • Sign Up

Copyright 2026 Jargonish. All rights reserved-ish.