undercrackers

[Victor Steinbok]

Seems to be fairly common and is in UD.

http://goo.gl/KbJmU
> "I should think so too," she said today. "What's wrong with a few
> pictures of pretty girls lounging around in their undercrackers.

OED has zilch, and oxforddictionaries.com is a bit over-restrictive:

> /British/ /informal/
> men’s underpants.

Collins and Dictionary.com get it right, though.

VS-)

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