FU

A complete and utter dick move done solely out of spite, often to someone who doesn't deserve it.

My boss writing me up for standing up to a rude customer was a real FU.

by Ubeenbamboozledson January 23, 2023

FU-

Its the word “FUCK” but you never got to end it

1: “we’ve been trying to reach you about your car’s extended warranty.”
2: “FU-“

by .unl0ded_3rror May 27, 2023

Fu

Foolish or trifling, just people who exhibit stupid behavior, also for objects that are trife

Thug 1: Y'all niggas so fu

Second meaning:
Thug 1: You like my new Jordans bruh?
Thug 2: They fu bruh! Michael Jordan never did that move, your shit fake

by ソサ// Sosa September 10, 2023

FU

1. An abbreviation for "fuck you"
2. Something that is done entirely to fuck someone over

AI Art is a massive FU to the art industry

by Ubeenbamboozledson March 29, 2024

FU

Fuck You

FU Motherfucker! Hahaha...

by Best User On Urban Dictionary August 10, 2025

;(fu

A defensive semicolon placed before a JavaScript IIFE that looks like a Gen-Z emoticon for "winking sadface, f*** you." Originated when two run_script() calls get concatenated without a statement terminator, causing unshift() to return 15 which then tries to invoke (function(){...})() as 15(function(){...})(). The semicolon breaks the invocation chain, restoring order to the universe.

Etymology: Discovered during a late-night Claude Code session debugging lightweight-charts hotkeys in a crypto charting app called Kore AI. The developer saw the pattern ;(function() and immediately recognized it as the most honest thing JavaScript has ever produced.

"My hotkey wasn't working so I added a ;(fu and the watchlist finally toggled."

1) what?

2) ;(fu

by drstarheartsong March 15, 2026

Fuח

Fuck plus!

The "ח" is a Hebrew letter pronounced like the ch in l'chaim

Versatile, as it is not an actual swear word, yet has a harsher sound than fuck and the strength of combining two languages.

Fuח you.
Fuח me.
That is waaay Fuחed up.
That was Fuחing awesome.

by Bursts Of Beauty August 10, 2016