wikipediac
Someone who has a limited knowledge on a vast spectrum of
subjects, mainly obtained by hours of surfing Wikipedia.
This person usually retains only one or two key footnotes on
any particular subject, yet they consider themselves "smart".
Debbie: "Ughhhhh! Here comes Dave, the walking wikipediac.
I wonder what he's going to bore us with this time..."

Dave: "Did you know that state highway 143 near Salina, Ks
uses 3 different types of pavement in its 4.6 miles?"

Cherie: "Oh, Dave, you're such a wikipediac!"