ETYMOLOGY
from cover (to put or something over an object, with the effect of hiding from view or protecting) + slut (an untidy, dirty, or slovenly woman; a woman who is habitually careless, lazy, or negligent with regard to appearance, household cleanliness, etc.)
EXAMPLE
“… But as it is a sad thing that the grace of God pretended, should be used as a pander unto wantonness, so it is no less hateful, that the providence of God should be misapplied as a cover-slut of idleness, ignorance, and unconscionableness: for who knowes not that our life is so in Gods hand, as it is ordinarily preserved ro lost by the use or want of things proper thereto? even hunger if self would be certainly mortal, if not appeased by meat appropriated thereto by the appointment of God. …”
From: Natures explication and Helmont’s vindication.
Or A short and sure way to a long and sound life.
By George Starkey, 1658
Lexicophilia 