A Japanese-internet laughter marker meaning something is funny — literally "grass," because a long chain of the letter w (from warau, "to laugh") stacked together visually resembles blades of grass, and "kusa" became a way to reference that visual joke as a spoken/typed word in its own right.
EXPLAINER
Funny Japanese with GIRI-O&DONNY · original source ↗
EXPLAINER
双頭アト · original source ↗
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REAL-WORLD EXAMPLE
"He tripped over his own feet trying to look cool, kusa."
LORE & ORIGIN
Grew out of 2channel/Japanese internet culture where repeating "w" (the first letter of warau, to laugh) to indicate laughter — www, wwww — visually resembled grass when stacked, leading users to describe something funny as literally "growing grass" (草が生える) and eventually just "kusa" (草) as its own standalone laughter interjection.
EQUIVALENT CONCEPTS IN OTHER LANGUAGES
MENTIONS OVER TIME
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