What Am I Testo

It starts off in a dangly position where it seems to be bored,
Then once in action, it starts to go stiff as it goes into a small, dark hole.
And goes up and down, and can cause bleeding if not done enough,

It rubs and rubs whilst going to and fro in the small dark hole.

Chorus
I love my life, goin to and fro in the small dark hole
how i love it, i'm exhausted after.
It usually occurs to me about twice a day,
But sometimes more if they're feelin ready 2 goOoOoO!

What do you think i am???? la de da la de da?
O I am the greatest toothbrush in the world,
what were you thinking you PERVERT????