High Quality Content by WIKIPEDIA articles! B1ff is type of internet slang that was created in the early days of the Internet by groups who felt they were being watched by government officials or corporations. This was a major step towards full 1337 (Leet); however, they originally had different purposes. B1ff, which only changes words only enough so a program looking for certain words doesn`t find them, whereas 1337 was created to prevent non-1337 humans from reading text.