X
X: ecstasy.
X-girlfriend: former Chavette fuckbuddy who doesn't know you stuck all your porno vids of her in action on the Internet.
Xylophone: "Nah!! Yer making it up, innit.
X: Marks the spot. Alt: your signature.
XXX: Rating for all your Chav DVDs.
Xbox: Cardboard that used to be a box. Alt: a games console you knicked out the Youf Klub.