occupation grunt
When a man in a stall makes a big, rude noise when he hears someone else walking in. It's like he’s saying, 'I'm here, and I'm not going anywhere until I'm done.'
'You're not getting in here, I'm still peeing!' he yelled.
'If you open that door, I'll come out and punch you.'
'I'm not done yet, and I'm not letting you in!' he snarled.