A tinkle fairy is presumably an imaginary being that monitors every moment you take a piss, it is mostly known for its limitations, such as 'the amount of times you can shake'. It was made popular from the showFamily Guy.
Adam West: *shakes twice*
Tinkle Fairy: Two shakes, that's it...Move along!
Adam West: Oh, why thank you, Tinkle Fairy!
To exchange something for the exact same thing you traded, or to trade something for the same thing you offered as a trade, or to make something that ends up being the exact same as the source material.
Tinking:
To exchange a dollar for a dollar.
To makegold from gold, or buy (the same amount of gold) with the same amount of gold.
Tinkle Tweakers are meth users who store their urine and feces, and attempt to recover the un metabolized methamphetamine from the urine and feces when they get desperate for another high.
The police broke down the door of the meth house only to discover the users were paranoid "Tinkle Tweaker s" and had jars, bottles, buckets, pots and pans full of urine and feces in case they desired to get high again and didn't have enough meth on hand.