Definition:

food; victuals

Example:

"Clearly, Anheuser-Busch knew what it was doing when it placed its 'hospitality tent' full of free beer and grub next to the press center at Tuesday's debate." – Adam Martin, New York Magazine, October 17, 2012

About the Word:

The grub that means "food" has the same (less appetizing) origin as the grub that refers to both a soft thick wormlike larva and a slovenly person. All these senses developed from a Middle English word meaning "to dig."