from Wiktionary, Creative Commons Attribution/Share-Alike License.
superlativeform of crumby: most crumby.
Sorry, no etymologies found.
I always ride my crumbiest bike when they demand my incarceration.
Besides, if the parents of the world really are that malicious toward others, then they deserve the crumbiest schools their money can provide, and it's not even worth worrying about how to make them better off.
UNIDENTIFIED MALE: The crumbiest news program on TV.