What is Thunder Jug?
1.
a container, usually a wide mouthed bottle, used by men (or adventurous women) to urinate in when other accomodations seem unobtainable.
on a road trip "hey space, pass the thunder jug!"
2.
A large, ceramic jug with straight sides, sloping shoulders, and narrow neck, with a ceramic finger ring near the neck. The jug is typically glazed light brown on the sides and dark reddish-brown on the shoulder, neck, and ring. It is intended to contain moonshine.
Ol' Zeke brought his thunder jug down to Orly's place for a refill o' corn squeezin's.