A person that asks way too many obvious questions. The questions asked could easily be found by the Sid, but the Sid would rather ask other people, continuesly. If the Sid gets ignored or gets no answer in return, he responds with "what?", pretending that someone did actually say something that the Sid just didn't hear. Sid's are typically referred to the Google website.
Me: Hey man, try this soda!
Sid: Thanks dude *grabs soda*. How much sugar is in this soda?
Me: Try looking on the back of the can, Sid.