What is 1690?
used to describe a woman who looks pretty hot from the back, but when she turns and you see her face, she turns out to be a haggard old woman, NOT the fine specimen of the female form you initially took her to be.
"Hey buddy, check her out!! Phwooaarr!!"
"Jeez, no way mate, she's a total 1690!"
1. A person who remains very unique as his or her own individual in a very secretive way. Man, she's such a ninjavidual. Look at the..