When you turn into a walking snot ball you have "The Crud" You cough up mucus and your nose runs constantly therefor the use of the word "crud".
You go to the office and you cough and blow your nose for an hour and a coworker asks "what's wrong with you?" Yo respond, "I have the crud".
A name for the depression you feel after making a large monetary purchase. Often associated with anxiety and regret, even if there was initial excitement and joy leading up to and immediately following the purchase.
You just bought a new car or a flat screen TV... or you just returned from an exensive vacation. "My new TV is awesome, but I still have the crud from buying it." or "Today's my first day back at work after our trip to the South of France. Man have I got the vacation crud."