When one's chin becomes rosy red due to ballsack / vag hair being rubbed against it for a significant period of time. Particularly prone to happen when performing oral.
I was eatingsuzy for 20 minutes and now I got this damn chinrose!
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.