To urinate in or over a body of water such as over a toilet bowl or in a pool, lake, river, or ocean. The act of peeing in the water as if you were disinfecting it with your urine.
After refusing to pay to use the bathroom, Juan and Nick went into the ocean to purinate the water.
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.