Definition of blue-moulding in English:

blue-moulding

(US blue-molding)

adjective

Irish English
figurative
informal
  • Covered in or gathering blue mould; frequently figurative, especially in to be blue-moulding for (something) (informal, chiefly Irish English): to have waited a long time for, to be keen for or desperately in need of (the thing specified).

Origin

Mid 19th century; earliest use found in Latter-day Saints' Millennial Star.