noun. (rro - sa - knee) A strong charactered individual who can be deceiving just by looks. Very goal oriented and never stops. If you attempt to break a Rosannie's heart, it will just chip/ surely get over it and move on with life. Life to a Rosannie is about being happy and doing what is best for themselves. If you happen to run into a Rosannie, you must be as cool as they are or be on the same level to form a close bond. A Rosannie can be trusted and loved for infinity.