It seems that lousy filmmakers are always trying to cash in on the original NIGHT OF THE LIVING DEAD, for two good reasons: a) it's a perennial horror classic that single-handedly invented the modern zombie movie, and b) it's in the public domain. Thus we've had colourised versions of the movie over the years, remakes, re-imaginings, and even 3D editions.
NERD OF THE LIVING DEAD is the worst of all these, as it stomps all over the original's classic status by turning it into a dumb slacker comedy. What the film does is create a new, deeply, gratingly unfunny nerd character and insert him into scenes of the Romero classic. Thus the film will play out in the background with the new character standing in front. The "comedy" comes from various puerile jokes, mainly fart gags and associated toilet humour. It's absolutely pitiful, and truly insulting to anyone who appreciates the power and originality of the Romero movie. This is the same reason I dislike all of the dumb Rifftrax/MST3K humour.