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!
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.