Now, this deserves analysis. It has a few levels.
My first thought was that your dong is so long that it reaches the floor and literally mops the latrine when you use the washroom. If that’s the case, time to ring that knob out 
But then, I realized … when has Tin Man ever aggrandized the size of his tinker toy? That’s simply not like him.
So, it’s this then, I assume. Mopping the latrine is the lowest of the low in the totem pole (rhyme not intended. I just naturally do that because my grandmother was a famous poet and I inherited her facial hair).
Tin Man! Now come, come. I know you’ve got some junk in the trunk. A nice monkey wrench in to throw into the gears (as it were). Don’t be so “hard on” your self.
Remember, there’s no point going to work if you’re not going to work hard. And that applies to mopping the latrines ESPECIALLY.