closet cusser Share definition Flag Very sweet , shy, quiet individual, but behind closed doors has the dirtiest mouth in history. Oh my gosh, Amanda is such a sweet girl, but I am sure she is a closet cusser. closet cusser by Strippin Zorro January 18, 2016 0 0 Get merch Get the closet cusser mug. Buy Now — $32.95 See more merch