To reveal the depth of a nerdy, trivia-centered hobby or obsession in an emotional way. This includes debating with other nerds about tiny minutiae and becoming agitated in the process. Most internet forums and wikis could not survive without people sperging out
all over the place.
'Sperg' comes from Asperger's Syndome, an autism-spectrum disorder that can manifest itself in obsessive behaviour, and which is commonly
self-diagnosed by spergin' nerds who can't
otherwise explain away their broken personalities.