a.k.a.: "P-mail"
A message left by one land-based mammal for another through the method of depositing urine in a place where another mammal is meant to discover and interpret it. Message is limited to the format of a personal add (species, gender, age, health & pregnancy status, etc.) but does include a rough timestamp. As with most messaging standards, readers will very according to quality and the accuracy of the information extracted from the message will vary accordingly. This method of messaging is used extensively by wild animals "marking their territory" and domesticated dogs on walks in public places.
It is nearly impossible to run with my dog in the park because he is generally too focused on checking and responding to his pee-mail for us to gain any momentum.
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.