Admirably large breasts.
Excuse me, boys, here comes Thunder Jugs Sal. I just have to sit and stare for a while.
Very large, impressive breasts. The kind you write home about.
Don't look at that girl over there.
Where? Oh, wow, you mean the one with the thunderjugs?
a container, usually a wide mouthed bottle, used by men (or adventurous women) to urinate in when other accomodations seem unobtainable.
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.