Occupied

Yes, Mr Crackhead,
I know that you're rattling.
I know that you're desperate,
But there are other things happening. 

This cubicle is occupied,
And I'm trying to shit.
And as soon as I'm finished, 
I'll be out in a bit.

I'd be much quicker you see,
But I have to implore:
That you stop knocking and shouting,
Through this clearly locked door.