crum something 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!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
crum something upand crumb something up
tv. to mess something up; to louse something up. (See comments at crumb.) Now, don’t crum up this deal.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.