To create a round-square would defy the laws of physics, philosophy, space, time, and spacetime. Such a thing could possibly cause the unweaving of the fabric of time and space. Existence as we know it would cease.
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.