modern boy
1920s slang abbreviation of モダンボーイ, referring to a fashionable, Westernized young man of the Taishō/early Shōwa era. Dated and rarely used outside historical or retro contexts.
See also: モダンボーイ
In the Taishō era, many modern boys gathered in Ginza.
「モボ」はモダンボーイの略で、当時の流行語だった。
Mobo is short for modan bōi and was a buzzword of the time.