What all this Kewl d00dz and 3l33t business?
One explanation offered is … “It all stems from warez, warez d00dz ‘traffic’ warez (pirated software). The practice of intentionally miss-spelling words and changing letters for numbers etc come partly from the necessity to ‘hide’ files. So if someone (especially a sysadm) decides to search the entire disk for a known software title, they wouldn’t be found” …
