Acerbated means bitter. Waaaay back when I was making a new email, I was angry and depressed at life, so it was acerbated_life. I eventually had to change emails because of random people adding me off some social networking site, so I shortened it to Acerbated. Now I use it for everything:
th, nexopia, emails, twitter, last.fm, anything I sign up to. It's my online alias.
My username before, lostxsoul, was derived from just feeling completely lost at the time, and I added an x because I don't think spaces were allowed in usernames before, and I didn't want to use punctuation.