When you really need a poo when everyone in the house is sleeping, and after defecating you don't dare flush the toilet in fear of waking everyone up.
by Robell93 May 11, 2010
When you're dehydrated and drink a large glass of water before bed, your insides churn and suddenly you're up at 1am taking a giant dump.
Dammit, I didn't get any sleep last night! Drank all that water right before bed, and woke up an hour later to take a giant night poo.
by phat_cartman February 9, 2010