from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The formation of cracks on the surface of paint layers.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A pattern of cracking of paint on a surface leaving roughly hexagonal areas of uncracked paint.
- n. The cracking of the surfacing bitumen on a bituminous roof or coating on a SPF roof, producing a pattern of cracks similar to an alligator's hide.
From the resemblance of the cracks to the pattern of an alligator's scales.(American Heritage® Dictionary of the English Language, Fourth Edition)
alligator + -ing, from the similarity in appearance to an alligator's skin (Wiktionary)