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6. grundies
A dirty pair of whitey tighties
Dude sniff your mom's grundies
1. 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.
From "The 12th Man Again", wherein commentator Max "Tangles" Walker discusses the perils of prolonged bouts of commentating on international cricket competitions:

"when you're sitting around in the commentary box for this length of time, it's not unusual, really, for the old cods to maybe nod off, get a bit numb; I think the best thing to do in situations like this is to get up, stretch the old legs; maybe even try to casually slip the old hand down and, maybe, give them a bit of a rub; probably try and adjust the old reg grundies while you're down there; try and loosen them up a bit. Anything, really, to try to get the old circulation going again."
2. grundies
Your underpants...
My grundies are soiled
by MH Jun 6, 2003 add a video
3. grundies
(Auatralian) shortened form of government regulation undies, refering to plain or uncomfortable underwear.
It was washing day so she had to wear her grundies
4. Grundies
Really gross underwear, usually worn by fat, middle-aged men.
i.e. y-fronts and a stained vest are grundies.
'Ewww, I can see Mr Francis in his grundies through the window Mom!'
5. Grundies
Older underwear reserved by women for *that* week of the month.
Janet kept her grundies buried under the nicer stuff in her her sock drawer.
7. grundies
A grundie is a common wedgie.

(rear, for the ladies)
When was your last grundie?
by Hyphen D Mar 9, 2005 add a video
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