Definition from Wiktionary, the free dictionary
yestermonth (not comparable)
- Last month; a few months ago.
2009 January 26, Alessandra Stanley, “A Fictional Ad Agency That Really Hawks [Your Product Name Here]”, New York Times:
- A little like the self-contradictory tag line “Instant Classic,” this series is infused with nowadays nostalgia, a trip back not to yesteryear but yestermonth.