To get better at something.
If someone messes up at work then a manager may say you need to sharpen up your buttons
An act of sexual mutilation where a woman place a razor blade between her breasts prior to a titty-fucking.
"Are you still looking into getting circumcised?"
"No need. A girl surprised me with a Glaswegian Pencil Sharpener last week!"
A device for sharpening dildos
My your dildo sharpener is efficient in it's duty
Tripping with the intention of learning.
It's helps to dose big when sharpening your diamond.
When it´s so cold your nipples harden to the point they can slice steel.
Doctor: "OMG I´m out of knives I can´t operate on this patient"
Doctor 2: "Hand me some ice and i´ll do some nipple sharpening"
An offensive insult used to describe a female that like prefers underweight males, indirectly referencing their intercourse which would resemble a pencil being sharpened.
I saw her in the car with that skeleton-looking kid, you know she's being used as a human pencil sharpener.