Seasoned ornithologist
A "lady" who is very generous with her reputation but should be avoided like the plague. A well beaten track.
Dave: I tell you Nicola looks good today
Wayne: Nah mate, she's a seasoned ornithologist
Dave: Huh?
Wayne: She's seen a cockatoo in her time.
Wayne: Nah mate, she's a seasoned ornithologist
Dave: Huh?
Wayne: She's seen a cockatoo in her time.