This is directly translated to grass, but it’s also Japanese slang for lmao. It comes from w which comes from “warai” meaning to laugh or smile. It’s the Japanese equivalent of lol. When something is hilarious you type “wwwww” (the amount varies) which resembles grass.

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The Chinese word for grass.

草 is a CJK ideograph character. It has two pronunciations for different meanings. One pronunciation is cǎo , which means grass, the other pronunciation is cào , which means a super powerful skill. The skill 草 can be given out by staring at the enemy, take a deep breath, point to the enemy with the middle finger, and shout the word 草 aloud. The skill 草 can be applied to people who hate you and people who use violence against you ( such as the people who implement violent attacks or verbal attacks on you ) . The effect of the skill 草 is 1. Remove all blessings the enemy got , 2. To make the enemy have a miserable life and cause the enemy to got an incurable disease , 3.Transfer all the curses imposed on us to the enemy. 4. There is a certain chance that can make enemy's luck reduced to zero by using the skill. 5. The skill have a certain probability to also do same harm to the enemy's parents, brothers and sisters, and children . You can also summon a dog and let the dog use this skill 草.

The top definition is misleading. It doesn't even acknowledge the fact that this is the Chinese character for grass, regardless what the Japanese variant means. The Pinyin for 草 is "cao", and it is pronounced in English as "ts-aw-oh". When you see 草, you better think of grass.