Urban Dictionary
sperg
'Sperg' is both a verb and a noun. It's almost always used for Internet purposes, and to sum up, it pretty much means a person with Aspeger's (or perceived to have it) that gets so dramatically passionate about a subject to the point where it's greatly aggravating to everyone else.
Some people find it offensive, others think it's the perfect term to describe their Asperger's. It'll all a matter of preference.
Dude, are you seriously going to point out every last difference/downgrade with the newer Transformers cartoon? Man, you're such a sperg!
Don't even mention Optimus Prime to Robert; he'll sperg out and will drone on about the history of his design for three hours.