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1.
A turd that somebody leaves in the bowl overnight.

The expression comes from the English game of cricket where a batsman is sent to the crease with the sole aim of still being there in the monring.
I went to the bathroom this morning, and my girlfriend had left a vile night watchman in the toilet.
by Bobtbuilder September 10, 2003
 
2.
- a bowel movement that refuses to flush after a night on the 'tiles', and confronts you the morning-after when it had all but been forgotten.
- "...euh! At least the night-watchman was looking over us last night Judith!"
by Glamracket October 25, 2003
 
3.
A shite that has been left in the pan overnight (either accidentally, or on purpose) that turns the water brown, and quite frankly, smells horrific for the first visitor of the day.
Fucking hell Frank, some bastard has left a nightwatchman in trap 3 - it nearly put me off my morning shite.
by John Kebab September 05, 2010
 
4.
a man placed in the rear of a mid-night train....
My heart is breaking cus I'm the night watchman in the rear of mid-night train..
My honey I won't see again, she leaving cus I'm a night watchman in the rear of mid-night train...

Hay it's better than a trud floating in the pot....
by itichie_nocanpo October 02, 2006