month of Sundays

[month of Sundays] {n. phr.}, informal A very long time. - Used foremphasis after "for" or "in" and usually with a negative verb.

Ihave not had devil's food cake in a month of Sundays.

When he gother first letter, he felt that he had not heard from her for a monthof Sundays.

Syn.: DOG'S AGE.