The crossword solution for the term 'EGGY QUAFF' is 'NOG', which is an abbreviation of the word 'NOGGIN'. NOGGIN is an old English term for a small cup or mug, usually made of wood or clay. It was used to serve drinks such as eggnog, which is a traditional holiday drink made with eggs, milk, sugar, and spices. Eggy quaff is another name for eggnog, and the abbreviation 'NOG' is used to represent it in crosswords.