Superlative form of crummy: most crummy.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "crummiest" in a sentence
"Since I was the last man in I got the crummiest bed—a pull-out couch in the den off the living room."
"Yes, it only makes sense that service dog fraud would raise its ugly head in a society where dogs are relegated to the smallest parks and the crummiest beaches, banned from eateries and retail shopping venues and generally regarded as pariahs by the transportation industry."
"Keep in mind this guy has eaten all over the world in the nicest places and the crummiest towns … NYC streat meat cant be that high on his list … theres way to much out there"