Roachy

(a).—Active, wary, light-brown insects with a “roachy” odour, found in pantries and bakeries; several species but the most common is the Croton-Bug or German Cockroach. (Ectobia Germanica)

Source: wiktionary

Why, it leaves spots, and if you should take a cup and saucer, probably put coffee in it and drink out of it, you have a roachy taste which you may imagine it might be the food that is spoiled, something of that kind, but it is nothing but the liquid that comes from the mouth of the roach.

Source: wiktionary

The harm the cockroach does, however, is not so much in the quantity of food it consumes as in the amount it taints and spoils; it leaves its excreta over everything, and tainted food, even when cooked, has a distinctly “roachy” flavour. This “roachy” taste and smell is communicated partly by the wax which is secreted by certain glands on the body, and partly also by the saliva ejected through the mouth.

Source: wiktionary

They come out at night to feed and are practically omnivorous, feeding on all kinds of foodstuffs, woollens, leather, book covers, etc., and where they occur in numbers impart a disagreeable “roachy” or foetid odour to shelves or articles they run over, in addition to tainting food.

Source: wiktionary