The way that some people, mostly on the internet type 'enough' to either save typing an extra letter, seem like a cool person or because they actually think that 'enuff' is the correct spelling.
==> Probably originated in Haydock, England.
Andy: "ho r u"
Fletch: "Not so bad, how are you?"
Andy: "nt gttin enuff sleep lol"
Fletch: "That's too bad."
Andy: "I no lol mite stay ov college 2mrw"
(... etc you get the idea.)