What are "hog lumps"?
Eat My Brains has listed under trivia for the movie:


  Specially designed packets of 'Hog Lumps' were designed for the film by Edgar's brother, Oscar. 


I don't think they're real, although there have been some claims online that there is a real product out there that markets itself as 'Hog Lumps' :


  They're real. Mr Porky's Hog Lumps and they're awful. Blech.