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.
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.
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