X-on 

Slang for someone who shoots an exceptionally large volume of ejaculate, typically after intercourse, and especially when a huge mess on the sheets and bedding results. Is a reference to the much-publicized oil spill from the 1980s.

Girlfriend1: Yo, look at those sheets! X-on must have been here!

Girlfriend 2: Ya, I'll be cleaning up for days.

X-on by Shogun Xll March 22, 2007

X on a mobile ad 

The only thing that is smaller than a quark

Frick, the X on a mobile ad is really really really really really really really small

X on a mobile ad by Wixkslfjdkfirjeje August 29, 2021

X on a mobile ad 

(noun) The exit button, notoriously small for mobile game advertisements.

“The x on a mobile ad is the smallest known object in the universe.”

X on a mobile ad by MaybeARealWord March 31, 2021

X on top

X on top is a term used when saying that you are not interested in anything else than a physical relationship and that you would not grow attracted to anyone giving you that.
The uses include but are not limited to:
1 a Greating
2 a Personal Message
3 a Good Bye
4 a Random Phrase

Example :
Hey Stacey X on top.

Now X on top.

Ok see you later Stacey X on top.

In the club he just kept saying X on top and some girl took him to the bathroom.

X on top by JamalSlide January 7, 2018

sex on x

Having sex on ecstacy. It will be very pleasurable but it will also make all sex for the rest of your life a worse because none of it will compare to sex on x. Do not have sex on x because it messes you up.

Sorry babe, but I had sex on x a few years ago and it just has never been good since then.

sex on x by cc runner August 25, 2007

Sex on X

The act of having sex after taking a hit(or two) of Ecstasy. Apparently, it's the most pleasurable sex can get.

Sex on X is the best fuckin' sex in the world!

Sex on X by Doc MC October 24, 2004

on X 

Basically the same as "on Jah" only you call him by his rapper name.

Ay nigga you got a cute ass on X.

on X by Wolvesrule29 August 12, 2019