Like Death Eating a Nab

The expression you look like death eating on a Nab means “you look terrible.” It’s a humorous elaboration of the idea of death, which refers to death consuming a dry, salty, peanut-butter-filled snack made by the Nabisco company. The more common phrase is you look like death eating a cracker. Variations include like death on toast and the simile Ralph Ellison used in Invisible Man (Bookshop|Amazon), like death eating a sandwich. This is part of a complete episode.