It means under the breast. On the diaphragm or sternum. It is an indication to register a girdle.
It is an abbreviation of the words in English under the boobies , which means under the breasts.Is refers to the area of the sternum that is located below the breasts in where some women tend to tattoo is.
underboob is incorrectly written and should write it as "UNDERWOOD." being its meaning: Name of a mythical typewriter estadounidense.Comienzan manufactured in the 19TH century ( 41 1896; and reach its great prestige in the 20TH ( 1920-29 ). They continued manufacturing until 1980. Today are very pursued by collectors. Hanbsalido in many films.