Also found in: Wikipedia.

crum up

slang To ruin something. A noun or pronoun can be used between "crum" and "up." You crummed up this report so much that I can't even fix it!
See also: crum, up

crumb bum

1. noun Someone viewed with disdain, often a bum or tramp. When we lost all of our money in the stock market crash, we were really worried that we'd end up being crumb bums.
2. adjective Of poor quality. Darn it, my crumb bum suitcase fell apart as I was trying to pack it.
See also: bum, crumb
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

crum something up

 and crumb something up
Sl. to mess something up. Who crummed the bird feeder up? Now don't crum up this deal. Who crumbed up my room?
See also: crum, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

crum something up

and crumb something up
tv. to mess something up; to louse something up. (See comments at crumb.) Now, don’t crum up this deal.
See also: crum, something, up
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
See also:
References in classic literature ?
Crum, attached as "Writers" to the honorable profession of the Law.
Crum was the older lawyer of the two, and the harder lawyer of the two; but he, too, felt the influence which the charm that there was in this woman exercised, more or less, over every man who came in contact with her.
Crum did, what he had never done yet in all his experience as a lawyer.
Crum opened his eyes--considered--and put another question as delicately as he could.
Crum offered a suggestion under the form of an inquiry:
Crum considered a little longer, and then delivered his word of advice:
Crum asked if a day had been fixed for the gentleman's marriage.
Crum had no wife; but he possessed a housekeeper--and he offered to send for her.
That's when Dusty "Wildman" Crum slogs barefoot through this swamp in pursuit of the Burmese python.
Corey Crum, his wife Shana and their 14-year-old son along with some other parents and teammates got together to repair the damages on Sunday.
Stifel analyst Drew Crum said he is less enthusiastic about this year's schedule of AAA titles for the third-party publishers and thinks near-term bookings growth, margin improvement, and cash flow gains may be more muted.
On January 14, 2013, Altman notified Crum & Forster of Sapphire's claims and demanded that Crum & Forster defend and indemnify Altman as to Sapphire's claims under the terms of seven insurance policies issued by Crum & Forster to Altman over the affected years.
By his count, sixty-seven graduates of the Northern Industrial Training (NIT) trade school in Palmer have taken rotational schedule jobs at Schneider in the last two-and-a-half years, says Joey Crum, president and CEO of NIT.
"WINEMAKING IS THE SAME no matter what winery you go to, regarding the nuts and bolts of it," said David Crum, senior director of direct-to-consumer membership and operations at Duckhorn Wine Co.
Redcar keeper Crum pulled off a few good saves but was beaten on 21 minutes when a clearance fell to one of their players on the edge of the area and she volleyed it into the bottom corner.