crum up(redirected from crumming 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!
crum something upand 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?