A phrase used to describe something (slightly) abnormal. In other words, something that doesn't usually happen in a normal day.
Joe: I've gotten a email from Tyler today.
Susan: What was in it?
Joe: He sent me something on YouTube that contains important information and said that I have to watch it. watch?v=oHg5SJYRHA0 I think I need you to see it too.
Susan: I'll check it out. *checks it out* AAAHHHHH!!!! TURN IT OFF! TURN IT OFF! *shoots her iPhone with a desert eagle* THAT was a bag of interesting.