A man the day before was digging a funk hole, and coming on something soft he plunged his spade into it.
I bet he slipped into his funk hole, though, when there was an air-raid on!
When I reached the front line I crawled in a funk hole and waited for dawning and for our own troops to come along.
Then I made a sprint for my funk hole at record speed, arriving quite out of breath after covering about three-quarters of a mile.
A hiding place when one is frightened (1900+)