mungy1
/ˈmʌn(d)ʒi/(also mungi)
adjective
Originally and chiefly English regional. Of weather: muggy, close.
Origin
Mid 17th century (in an earlier sense). Origin unknown. Perhaps related to mug, mug, muggish, muggy.
mungy2
/ˈmʌŋi/North American informal
adjective
Unpleasantly messy, soiled, or dirty.
Origin
1980s. Probably from mung + -y.