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Underpants (Australian Slang). May be acceptably abbreviated to "durps".
Crikey mate, I haven't changed me underdurps in a week and the blowies are hangin' round me arse.

Translation: "Oh my goodness, sir. I have neglected to replace my underpants in seven days and there are flies surrounding my nether regions."
by Gobber Wart June 23, 2009

Words related to underdurps

dacks durps jocks knickers underpants