(cheifly British)

In the UK, 'X' is commonly used at the end of a message to represent kisses. Similar to 'Xs and Os' (kisses and hugs) in North America, however 'X' can be and is often used by people of varying familiarity (platonic friendships, siblings, crushes, dating, married, etc.) Usually more Xs means more familiarity. Xs can be seen used between two people of the same sex without being regarded as homosexual.

n. slang for the drug Ecstasy (C11H15NO2)
(methylenedioxy-n-methylamphetamine) MDMA

A symbol meaning affirmative or appealling. Can be signalled with the crossing of the arms forming an X. It can be used to state "Yes" or to distinguish someone as being very appealling.

The antonym is O signifying "Out" or "No".

an insane woman probably originally named christina, who changed her name to X-tina after the christina auguilera era, then dropped the -tina, to now be known as "X". Commonly recites the phrase that X gonna give it to ya, and probably knows how to get down.

Used as a prefix and/or suffix to online nicknames usually belonging to females who crave attention. Many can and usually are used at a time and vary in capitalization.

blue and yellow purple pills

a letter which is completely unnecessary, because "z" and "cks" already exist. Q, c, ph, gh, oux, and the e at the end of words are also completely unnecessary.