A substitute word for penis. Usually used by moms and dads when talking to their little boys. Sometimes used when conversing with juveniles. It could conceivably used by adults.
"Timmy, wipe your tinkler after you go wee wee in the toilet."
The clitoris. Popularized in the Deep Throat movie. The doctor is explaining that the reason that Linda does not have orgasms is that she has no clitoris; it is later discovered to be in the back of her throat
Linda: l mean, there should be more to sex than a lot of little tingles. There should be bells ringing, dams bursting, bombs going off, something Dr Young: No wonder you can't hear any bells! You don't have a tinkler!