Diddy (Sing.) Diddies (pl.) Share definition Flag Excrement, Poo, Turd, Log, Shit, Plop, Whopper, Crap. Harry has left a big diddy in the toilet. I've just picked up the dog's diddies in the garden. Diddy (Sing.) Diddies (pl.) by E MacGregor March 29, 2004 0 0 Get merch Get the Diddy (Sing.) Diddies (pl.) mug. Buy Now — $32.95 See more merch