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."

My grundies are soiled

We gave the stupid little freshman a wedgie after he asked us where the elevator was.

I fucked up this weekend, done a grundy didn't I

"Wow! He seems a bit far up himself!"
"Yeah he is a bit of a Grundy."

dude, did you see what happened to that new fat kid on the playground? He got a grundy so hard it ripped the elastic off his nuthuggers!!!

When that fat chick spread her legs, that shit looked straight grundy!