H4×0r — also called Haxor, leet speak, and 1337 sp34k, among other variations — is a slang word which is used to represent a kind of letter replacement code frequently used on the internet.
In this code, letters are replaced by numbers and other special characters in order to make the characters look more or less like the host language (usually English). This was originally done to throw off non-techies and try to hold secret conversations without actually having to learn another language. In order to further the confusion people purposefully or idiomatically mis-spell words, often inheriting idioms from net speak. Unfortunately, like with net speak, most of the time the spelling skills in question are poor anyway.
The non-standardized nature of the replacement means that inevitably, to be understandable to other users of H4×0r, the replacement code had to look enough like English that anyone could figure it out given time and a touch of practice. This seriously diluted it’s value to the point that no serious techies use it any more.
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