Coming from the french language
Means to see again..
In short a "hi again!"

when used in letters: it means "regarding"

Shortcut for 'I return' or 'I am back' in chats. Person tells comunity that he/she return from something.

This use to be a Greek insult and the complete word is more(2 syllables, mo and re). Now it is commonly used amongst friends at the end of sentences or at the beginning to refer to the person that they are talking to.

Re is an interjection commonly used in the greek language but also used in tha Balkans. It is used in speech to gain someone's attention, add emphasis, insult, or express surprise or astonishment, like the Spanish che.

The word probably comes from μωρέ, the vocative of the ancient Greek μωρός 'dull, sluggish, foolish, stupid'.

re is often accompanied by a slang word but generally speaking you can use it any given sentence.

A shortened form of retard, is used to put another person down.

1. (noun.) Pronounced "Ree" - A greek word used to catch the attention of someone. Also used to call someone stupid, a fool, or just plain dumb.

2. (noun.) Also Pronounced "Ree" - A developing slang word in the city of San Francisco. Short for "retard" Similar to a " 'tard "