The 汉 here is short for 武汉, the city, not 汉族 (Han ethnicity). The Wuhan dialect (武汉话) belongs to the Southwestern Mandarin (西南官话) group and is famously crisp and quick-tempered.
usage
The same -腔 pattern names other regional accents: 京腔 (Beijing), 港腔 (Hong Kong / Cantonese-flavored Mandarin), 台湾腔 (Taiwan accent), 广东腔.
