- NZ informal men's underpants
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for grundies
"Margaret has no Mrs. Grundies," said I, rather indignantly.
With half-a-dozen men, one girl, and a host of Mrs. Grundies, you are brave if you think you can manage to engineer a good time.