person 1: have you read my latest fanfiction?  person 2: no when is it set? person 1: post fall
post-fall is the term used by sherlock fans to tell you that whatever you are talking about happened after sherlock jumped off the hospital
"person 1: have you read my latest fanfiction?  person 2: no when is it set? person 1: post fall" What is the definition of "post fall"?