1. Used "haxx0r-speak"/leet (l337) in a ridiculously unnecessary way, such as fanfiction or homework.
2. Having fashioned a username where one has difficulty telling what characters are used (i.e. small L (l) confusable with big I in some cases), which makes typing it out in order to add to a friends list (or banlist) nearly impossible.
Man, Exile really L33ted-up his username, it's actually exiie.