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1.
Admirably large breasts.
Excuse me, boys, here comes Thunder Jugs Sal. I just have to sit and stare for a while.
by Joao Bufamarillo May 13, 2005
 
2.
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!"
by kilo sierra April 08, 2004
 
3.
Very large, impressive breasts. The kind you write home about.
Oh, sweety?

Yes, dear?

Don't look at that girl over there.

Where? Oh, wow, you mean the one with the thunderjugs?
by Tuna Wanda May 26, 2005
 
4.
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.
by Joao Bufamarillo May 13, 2005