mak kau hijau

Insult, although not a derogatory term. Shortened form of "emak engkau hijau", which literally translates to "your mother is green". First found from a video of two Malay boys arguing in a park, with one of them proceeding to say the above phrase. Later scenes show them engaging in a fistfight.

This phrase has become the mother of all insults in the Malay-speaking world of the Internet, although some say in the SouthEast Asian world of the Internet as well. This phrase is popular among Malaysian netizens when foreigners say stupid things about Malaysia or Malaysians.

It is simply a roast.
Meaning Your Mother Is Green
Kids in Malaysia use this roast its kind of a signature roast.

a harmless insult used by Malaysians to insult other people that they don't like.

is an expression, originally from Malaysia to stated that you hate someone.

"Mak kau hijau" is a Malay phrase which literally translates in English "Your mother is green".

This phrase origin came from a video that went viral in Malaysia about 2 kids was insulting each other. One of the kid spontaneously said "Mak kau hijau" maybe because out of words after being insulted and angry at same time. The reason it went viral because that phrase has no meaning of insult at all and it is funny when he said that. That is why netizens of Malaysian keep spamming each other with this phrase at that time more just like to joke with each other.

The phrase itself has no insult meaning but when foreigners comment something bad about Malaysia, they will get floods of reply "Mak kau hijau".

"Mak kau hijau basically your mom is green. In Malaysia, this phrase usually being used when someone want to curse at someone in polite way. You just need to say the phrase without adding any words.

Originates from a Youtube video showing a Malay kid showering infinite praise for the cameraman's mother.
(1) Your mother is an environmentally-friendly woman who cares deeply about forest reserves and everything eco-related.

(2) Ur mom green