When you yell something that makes turn around, and want to make people think it was someone else.
People think that you weren't the one to yell it, because they think you were talking to the person next to you about possums.
Person A: KYLE!!!!!!
-kyle turns around-
Person A: And then, the possum,
Person B: Dude, you like Shirey?
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).