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cà khịa
To tease, to poke at someone for fun
Built from
- cà to rub or scrape along something
- khịa to needle, to pick at
Scraping and needling, over and over. That is why it means low-level provocation rather than a real fight: the image is friction, not a blow.
How people actually use it
Mày đừng cà khịa tao nữa, tao bực đó.
Stop poking at me, I'm getting annoyed.
Who can you say it to? Fine with anyone your age.