Originally dates back to the name given to the allied armies in WW2 to the German Nebelwerfer, a multi-barrelled rocket launcher which rained down terror on allied troops with a horrible screaming noise to accompany it. (see google for definitions and picture)

In modern useage, it refers to someone who never stops moaning and has an annoying voice which grates on your brain as they give you the toungue lashing.

Chris is a real moaning minnie
by Age_Wills November 15, 2006
Get the moaning minnie mug.