grubster means: The person who is able to do the job by any means. Grubsters are tough, determined, and mean. It was originally a nickname given to a high school football linebacker. He was called Bing, which doesn’t sound tough. His team-mates called him Grubster. His “pop” sounds would echo throughout the stadium as he would strike men so hard. It’s a term that I still hear used twenty years later. Even people that I do not know are familiar with the term. (in Community Dictionary, added by Veronica Bonilla)