1) Hitting on, flirting, or generally just messing around with somebody whose taken. Even jokingly.

2) Someone who commits the act of Cex. Someone who acts like a perv when others are making out, hugging, etc.

3) Used like sexy or shmexy, to mean something cool.
"OMG did you just see that? that hot chick was totally just cexing me!"

"dude: Aww man I was just hittin on that hot chick !
guy: Isnt she with her bf?
dude: yah... so?
guy: dude you are such a cex"

"that is so cex"
by zorothepantsifier September 16, 2007
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Low-life virgins that have never seen a pair of tits that are not attached to themselves and also could legally have their penis declared dead because they have not seen it in yonkers. They also smell like all of a Y9s changing room BO at once and have not showered since Britney Spears shaved her head and went crazy. They also spend their time at home having intercourse with their siblings and also enjoying games of Nintendo DS Monopoly and Scrabble with their cats (generally called Pimple). If you have gotten to the point where CEX is you're only option as a job you might as well end your life or become a feet pic dealer at the local bingo club on Thursday nights.
Phil: Look at those scummy twats over there, I bet they work at CEX.
Francis: Yeah Phil, they look like sister fuckers to me and they smell of Heinz Ravioli.
Phil: Yonkers you're right Francis, I bet they spend the day scamming chavs into buying broken Wii balance boards for their morbidly obese mum with 11 children who start smoking at 8 years old however that is normal on a council estate in Croydon.
Francis: Let's beat those Cex Workers with a stick!!
by Ivor Gifford June 13, 2020
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cex is a virus be careful and wear mask
look better wear mask or cex will infect u
by urbanantivrus.jpg June 7, 2021
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