An "MOC" or "Moment Of Confusion" is a dating term used to refer to those confusing moments when you believe that someone has a crush on you, but you cannot be fully certain if they truly like you. If someone creates a nickname for you, teases you, acts nervous around you, tries to impress you, stares at you intently,makes conversation with you, flirts with you etcetera it is an MOC.
Anna: Did you see how Ben couldn't stop staring at Katie during drama and even asked her to work with him on the new assignment? Total MOC!
Serena: I definitely agree with you. Taylor and Ryan also had an MOC today because they were also flirting non-stop! They would be such a cute couple.
Anna: MOCS are so much fun!