Fast food was a type of food that was made and sold quickly.
When the Cold began their attack on humanity on 2 April 1963, Susan Foreman and some others took cover in a Wimpy Bar. They lived on hamburger buns with ketchup, frozen burgers being the next option. (PROSE: Time and Relative)
In Perivale, Ace worked at a fast food chain where she encountered the Ergon. Mistaking it for her friend Barry Groves in a chicken costume, Ace gave the Ergon a box of fries, which it returned to its master Omega in the anti-matter universe. (PROSE: Anti-Matter with Fries)