Mine is iam4u2nv which is I am for you to envy.
This go back to my old school days of chat rooms acting tough.
Dullard: "A person regarded as mentally dull; a dolt." "A stupid person; a dunce." "A person who is not very bright." Definitions were from three common dictionaries.
Sorry, I don't want to make this sound rude but it was people who use usernames like yours that help me pick mine. I saw far too many people with exaggerated names (referring to great intellect, great body, great skills, etc) yet their posts left a lot to be desired (ie they were dumb, ugly posters without any skills). I found over time that the more grandious the name, often the worse the posts were. Their nicknames were usually an attempt to cover up their mediocre lives.
This isn't always the case, and iam4u2nv might be an exception. So I went the opposite route. I chose a humbling name and let my posts speak for themselves.