Somebody who gets sidetracked from work/homework so much so that they engage in masturbation.
Aaron H: Hey man, have you don't your work yet?
Steven H: Sorry, I was procrast-urbating last night? Can I do it for tomorrow?
Aaron H: Dude, you are such a procrast-ubator!
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.