SinX 

1. Assassin Cross in Ragnarok Online.
2. One of the more unbalanced classes in Ragnarok Online, often chosen due to it's tendency to hit hard and fast. Very popular with players who choose it because a) it is aesthetically one of the cooler looking classes, b) it is a completely offense-oriented class thus great for solo-ing, or c) it is an overpowered advanced job class in PvP.

"I was going on an MVP hunt with some friends when this SinX came by with his Priest friend and KS'ed the boss."

SinX by munkeynin October 16, 2008

Sinxui 

the gayest fatass to ever grace the world

That guy is definitely sinxui

Sinxui by sinxui_a_fatass April 28, 2020

sinxp 

The pinnacle of manhood.

Omg that guy is from DBPU! He is obviously sinxp-like!

sinxp by Beanieeeeeeeee July 7, 2010

Sinxtija 

Sinxtija is a Tiktoker who is 10 years old with over 1k Followers. She got popular from one video with 130 for dancing with a 11 year old shorter than her. Sinxtija is 4'11 and her friend is around 4'9.

"Omg look its Sinxtija!"

Sinxtija by The Real Million Dollar Puthay January 28, 2021

Sinxality

a cute italian twink

You see him over there?
Who?
Josh, he's such a sinxality..

Sinxality by Jonnyboy245 April 23, 2024

sin(x) 

cool wavy lines

person 1:i graphed sin(x)
person 2:cool

sin(x) by real human totally January 21, 2024