Longman Dictionary of Contemporary English
Wiktionary
n. Paving with pieces of irregular size and shape that fit together and (approximately) cover the surface.
Wikipedia
Crazy paving is a means of hard-surfacing used outdoors, most frequently in gardens. Paving stones of irregular size and shape are laid in a haphazard manner sometimes with mortar filling the gaps between. The method originated in Ancient Rome.
The term may also refer to a pattern seen on computed tomography of the chest, involving lobular septal thickening with variable alveolar filling.
Usage examples of "crazy paving".
Now, you remember, I told you there was blood on Goldschild's crazy paving and blood on the hedge at the back.
When he frowned the filth on his face cracked like crazy paving, a second skin of grime which Was the accrual of many months.
A plate of spaghetti, the spirograph pattern on a lampshade, the crazy paving in the back garden.