-The stain left on a table from a cold glass of water.
-A mark left on a surface by the bottom of a wet glass or vessel. the dregs in a glass, or the remaining part of a substance in a vessel. the end of a salami, loaf of bread etc.
From the Italian culaccio + -ino, derived from culo (“bottom”, literally “butt”).
Used in a sentence:
“The most irritating thing about having a soiree is the cleaning up after; and the most irritating part of that is the finding of a culaccino on our George II walnut side table.”
(from the Grandiloquent Word of the Day FB page)