Wiktionary
consume mass quantities
vb. 1 (context chiefly US idiomatic often jocular English) To eat or drink food or beverage. Note that "mass quantities" is often mistaken for "massive quantities," which is not the original phrase. "Mass quantities" are simply amounts of "mass" that are consumed. 2 (context chiefly US idiomatic by extension English) To use large amounts of any resource.
Usage examples of "consume mass quantities".
And while we consume mass quantities of junk food at Claudia's, Dawn usually munches on an apple.