It derived from Hakka linsi - 淋勢，meaning pretending very powderful. This matched with meaning of arrogant and haughty.

Now become make sense coz in Cantonese langsi doesn't make sense, Cantonese langsi - 撚屎， literality meaning poop noodles, a gross activity which is nothing to be swaggered about.

The supposed correct derivation should be langsai instead langsi. Dunno what happened lost in translation.

This post has been edited by MPPJ: Jan 18 2020, 08:29 AM