monthly grumpies Share definition Flag 1. Any moodiness experienced by a woman while she is PMS-ing or on her period "Oh, don't take Diana's mood swings too seriously...she's just on her monthly grumpies." monthly grumpies by TenkoHime May 16, 2010 0 0 Get merch Get the monthly grumpies mug. Buy Now — $32.95 See more merch
