Stinkpot!

I always used this insult as a child. It was a non-expletive safe word that mom and dad would even use jokingly when we were being silly.

So me, the obsessive etymologist, found, on a pirates' site of all places, the origin of the word.

Stinkpots were small clay pots usually filled with burning sulfur (and sometimes plant gums and rotten fish!) that were thrown onto the deck. A crude form of tear gas, it was hoped the smoke and fumes would overwhelm the victims' desire to fight (or maybe they would vomit themselves into submission).