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Wiktionary
thundermug

n. (context dated English) chamber pot

Wikipedia
Thundermug (band)

Thundermug was a Canadian band that was active from 1970 to 1976 and from 1991 to 2001. They released two top 40 Canadian singles and five albums.

Usage examples of "thundermug".

Then, out a the east come them motherworshipin False Folk with their long straight legs and long straight necks and flat faces and thundermug round heads and their bows and arrows.

The nobles would, understandably, given the cold outside, prefer to use one of the thundermugs sitting on the stone floor next to the garderobe, instead, rather than exposing their private parts to the cold air.

The nobles, however, would probably be relieving themselves in thundermugs in their relatively warm quarters, rather than having to unbutton their noble flies - or worse, plonking their naked, shivering, noble buttocks down on a garderobe's frozen seat, and finding that they had stuck to it, more likely than not.