Definition of hakkas:
(adj) :
Of or relating to the Hakka (Kejia, 客家 (Kèjiā)), an ethnic group of the Han Chinese.
(n) :
A person of Hakka descent.
(n) :
A Chinese language mainly spoken in the south-eastern part of mainland China (Fujian, Jiangxi, Guangdong and Guangxi), Taiwan, Hong Kong, and by the Chinese minorities in Southeast Asia.