When's the last time somebody actually posted here to explain their avatar? 
Anyway, mine's been the same for almost two years now because I'm too lazy to change it. It's Miss Sakaki from Azumanga Daioh, which is the only anime I've ever really watched, mainly because I fear I'd probably get sucked into it and never stop watching them. Also, l love that bored and intimidating look she's got going on, even though she's really a nice person. Kind of how it is for me in real life, really.