An inadvertent mis-rendering of the saying "making a mountain out of a molehill" - enlarging an issuebeyond its merits or needs - which unintentionally and charmingly accentuates the disparity.
"So what? You lent me your car to go grocery shopping. For whatever, an hour, and I brought it back! It was not three weeks later! Sixteen days is much closer to two weeks. You are so totally making a mountain out of a molehole".
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.