Nemo is a nerd and an emo combined into one person. A nemo is someone who enjoys nerdy activities yet is depressed to the extend of an emo, partially because of the social rejection of the nemo's peers.
Nemo is comprised of the first two letters of the word nerd (ne) and the last to letters of the word emo (mo). Nemo means nobody in Latin and so is a nerdy word and the meaning nobody is attractive to the emo side of the nemo as it helps them feel worse about themself.
<Nemo> Oh my God, I can't solve the final Euler problem out :'(
<Nemo> I'm such a failure, I'm just going to crawl into a corner and die! :'(
***Nemo cries some more
(please notice that this is in IRC format - Nerdy ;))