Present participle of μαζάω , masculine nominative plural, evidently quoted from somewhere.
Hesychius glosses μαζῶντα as τὸν μάττοντα τὰς μάζας , "one who forms barley-cakes."
The present figurative application (for which cf. generally ὑπερμαζᾷ at upsilon 321) stems from the use of maza in one of at least three sexual senses: female genitalia, anus (man's or woman's), phallus; J. Henderson, The Maculate Muse (New Haven 1975) 144 #175, 200-201 #446, 202 #452.