Perhaps because of certain distinct physical differences between male and female, this term has been used to describe abilities that are more common in the male sex. Such abilities include; map reading, spatial awareness, computer programming, DIY, and mathematical ability.
A girl with a very sexy body but an unattractive face... This phrase is generally uttered by men who examine the posterior of a lady as they drive by, On the approach they say "Oooohhh" and if her face does not match the beauty of her posterior as they pass they will say "Naaaaaa", hence Una.
