They go wild when they hear fast techno, and dance in a style that looks like it breaks their legs, hence they "krochn". Krochn is the austrian slang for breaking sound.
Language includes Austrian/Vienna/EastAustria slang such as "Bam oida", "Fix oida" or "Krochn oida!".
They keep this culture constant by exchanging their style in videos on youtube. Sometimes they also "kroch" while wearing army uniforms, it seems that "krochn" is a favorite pasttime in the austrian army.
B: Fix oida, leiwound!
A: Oida, korräktes tüchl!
B: fix oida
A: krochn oida.
B: bist voll der krocha