X-Com 

Game series, based off of UFO lore as well as own made up stuff. Original came out in 1994, with Terror from the Deep coming out in 1995, and Apoclypse in 1997 as direct descendents. There are other games based in the same universe, as well as two planned but cancelled games named Genesis and Alliance.
PC Gamer has the original free in its 2000 september disc.

As a word it can be used to describe any type of alien defense force, as X-Com comes from a 3 word phrase of close meaning.

You think most X-Coms are pretty crazy, don't you?

X-Com by Material Defender December 8, 2005

x.bby..addi.x.com 

x.bby..addi.x.com: she is a young tiktoker that makes amazing edits on Tiktok star Addison Rae. She has her own account where she shows her face but keeps her face anonymous on her fan account. She is kind and loves her followers with all her heart and acts like they are family. She calls her fans ( family) Dino’s / cherry’s

Girl: do you know x.bby..addi.x.com?

Girl 2: yes she’s my idol!

x.bby..addi.x.com by x.bby..addi.x.com December 11, 2021

. 9.0.X.com.2012.Pero Tu Rompe.2012..9.0... 

. 9.0.X.com.2012.Pero Tu Rompe.2012..9.0...

. 9.0.X.com.2012.Pero Tu Rompe.2012..9.0...

. 9.0.X.com.2012.Pero Tu Rompe.2012..9.0... by .6.9.7.6.ArimorylulA.8.3.0.5. August 4, 2025

DJ x Commander 

A ship between the DJ and Commander from Tower Defense Simulator (A.k.a. TDS). Admit it, if you know this ship you have definitely seen the Maidboy Commander and DJ and thought they were hot.

“Hey do you ship DJ x Commander?”
“Hell yeah, Gay LEGO.”

DJ x Commander by Kasodus69420 February 1, 2021

Jak X: Combat Racing 

Jack X is a racing game made for the PS2 by naughty dog. It continues the adventures of Jak and Daxter, following Jak 3.

"Jak X: Combat Racing was my childhood."

Jak X: Combat Racing by Epic Does Things April 23, 2017

X rated compliment

an X rated complement means intensified, complement with sexual indications about one’s bodies or act of performing on those bodies.

Dam girl that ass is so phat ima need 3 heads just so you can sit on it ( x rated compliment)

X rated compliment by Paulo278323 May 21, 2024

Four x Citrus mpreg comic

An extremely strange but hilarious fancomic

the name comes from Four, who is a genderless (commonly seen as male) BFDI character, and Citrus, a male Objectified character

A: dude, did you read that BFDI fancomic?
B: Yeah, but it's a Four x Citrus mpreg comic

Four x Citrus mpreg comic by mybrainhastoomuchbfdi March 6, 2025