Meaning verdant or green stuff in French. Awesomeness oozes out of a Sylvie like sap from a maple tree. If you ever get a chance to hang out with a one, make sure you do because you will be transported to a mystical land full of amazing adventures that you only thought existed in your imagination. Basically the BOMB!
Person 1: Hey, last night I played tag in secret underground tunnels in Mudd!
Person 2: Whoa! You totally pulled a Sylvie!