nib

Tip of the penis, also known as a nib end.

Jo: I hear Dave caught his nib in the drawer yesterday.
Tom: Ouch! What a nib end.

Lavatory Junkie

One who is a junkie of the lavatory and visits it in excess.

God dammit thats the fourth time in half an hour I been to take a pee. And I spent an hour on the crapper this morning, I'm becoming a lavatory junkie.