The practice of dropping the right movie quote to perfectly describe a real world scenario has been around for decades. The response for those of us with the biggest library of classic "muzings" at their disposal can range from a nod of respect to outright applause in the right social situation. We've asked some of the best in the business to contribute to The Muzing Dictionary, to create the world's deepest well of classic movie lines, with the definitions of their proper use. Feel free to borrow liberally from this site when needed, and to add any you feel are missing.
Vanity, definitely my favorite sin.

Movie: The Devil’s Advocate
Definition: When you’re getting dolled up for the night and your girlfriends nag you about your constant pride in appearance, drop this as you apply one more stroke of the makeup or pump of the hairspray.
Submitted By: Jessica Turner of Billings, MT

Look at me…underestimated from day one.

Movie: The Devil’s Advocate
Definition: When you stroll into any party or gathering with friends and acquaintances you haven’t seen in awhile, drop this as the onlookers are clearly impressed with the other half on your arm.
Submitted By: Connor Quin New York City, NY

Movies