When heartburn has reached apocalyptic proportions and can only be described as lava in the esophagus. Usually occurring in the third trimester of pregnancy.
I had Mexican for lunch and pizza for dinner. It gave me Lavasophagus all night long.
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.