Creeping Crud means: Close relative to “you don’t know where this’s been.” When you are unsure of the location or type of invisible dirt and germs on a surface, creeping crud can be described as when you cannot touch that material. This term is also used to refer to an indistinguishable substance or crud that is actually creeping. (in Community Dictionary, added by Swashbuckler)

What else does Creeping Crud mean?

  • This is military slang for extremely contagious virii, such as stomach bugs and colds. If it leaves a person suffering from a runny nose and severe symptoms such as sneezing, nausea, vomiting, diarrhea or extreme muscle weaknesspain. It seems to climb up all the ranks. (in Community Dictionary, added by Mia Cisneros)