Nancy was heading to a wedding overseas and was concerned about looking her best due to the probability that this event could result in a definingphoto of her on facebook.
The act of tucking in your undershirt into your boxers or underwear for a better feel and control. It keeps the undershirt from getting untucked and bunching up at the bottom of your tucked in outer shirt.
Oh man I am so glad I am dringing it today, usually when I fly my undershirtbunches up and I look sloppy.
When someone makes an urban dictionary definition of their own (or someone else's) name to either call them out on something or make themselves (And everyone else with that name) seem cool.