Somewhere where one goes to 'relieve themself' as opposeto the 'poo-parlour division'!
Random person 1: "I really need to go to the piddly-diddly department"
Random person 2: " Ahem...I think you should have gone to the poo parlour division"
Piddly Winks is a game where a button is dropped into a urinal and a competitor pees making the button go round in a circle. The winner is the person who gets the most rotations of the button.
Jim: "I had a game of Piddly Winks but only managed to get a score of 4!"
When you peel part of a banana down, and remove the fruit part of the banana. After removing said fruit part you take a dump in the vacant space of the peel, then sealing the peel making it look like it hasn't been touched. Now whoever should open this banana should say the word without even knowing it.
Kenny: Want a banana?
Bob: Sure KENNETH!
*Bob peels open banana peel/piddly dink*
Bob:AAAAAAAAH!!! It's A PIDDLY DINK!!!!!