A white person or group or people who is/are obvious ideological terrorists (usually domestic), but because of their white privilege will never be classified as such by their government or main stream media (MSM).
White + ISIS = WHITESIS.
The recent massshooting in Las Vegas, that resulted in the death of more than 50 concertgoers, was perpetrated by WHITESIS.
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.