Green’s Dictionary of Slang

(US campus) someone who identifies with the styles and concerns of the 1960s.

1992		Eble Campus Sl. Apr.
1996		Eble Sl. and Sociability 44: Granola triggers an association with other kinds of health foods, which in turn inspire alternate forms for indicating ‘someone who identifies with the styles and concerns of the 1960s’: granola-groid, crunchy granola, crunchy, grape nut, nut-n-berry, rice-and-beaner, earth biscuit, and earth muffin.