What is "halbstarke"

Halbstarke ("beatnik", literally "half-strongs") is a German term describing a postwar-period subculture of adolescents – mostly male and of working class parents – that appeared in public in an aggressive and provocative way during the 1950s in Germany, Austria and Switzerland. Later, the term sometimes described youths in general. While in German, it is still in use today for young, aggressive, mostly male adolescents, it has mostly fallen out of active usage in English.