grundies
(Australian): Underpants.
Derives from Sydney Rhyming slang, "Reg Grundies = Undies", which is a reference to that excellent Australian TV production outfit Reg Grundy, behind such televisual classics as Neighbours, Home and Away, The Sullivans, etc.
Synonyms for grundies
On this page, you will find 30 slang terms related to grundies. Some of the top words include: keks, Dunnie, Freckle, grits, kek, and 25 more.