Rosemary refers to herself to the Detective Inspector as a "Squidger." "Squidge" refers to the squelching sound a person makes when working in the mud. Originally the term referred to gatherers of seaweed for lime and moss for medical treatment. Certain plants are good for fish and sewerage treatment, so people would 'squidge' for reeds and similar plants for such purposes. Because the term is rather archaic, if you Google it today you will likely only see results having to do with the other use of the term "squidger": a specific coin used in Tiddlywinks.