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しぬ shinu
I'm dying — laughing, mostly.
What does shinu mean?
The verb really is to die, used as pure hyperbole about your own state: 笑いすぎてしぬ, too funny to survive. Only ever about yourself. Aimed at another person the same verb is one of the ugliest things in Japanese.
Example
笑いすぎてしぬ、もうやめて。
I'm laughing too hard, I'm dying, please stop.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
Culture note
The older, safer form is 死ぬほど — dying-level tired, hungry, happy. The bare verb in hiragana is the casual online version and stays inside the joke.
The story behind shinu
Japanese has intensified with this verb for a long time: 死ぬほど眠い, sleepy to the point of death, is ordinary spoken language and nobody hears it as morbid. What is newer is dropping the grammar and posting the verb alone, usually in hiragana, which softens the look of it on the page.
The direction of aim is the entire rule. About yourself it is comic exaggeration, and the fandom uses 尊すぎてしぬ, dying of how precious something is, several times a day. Turned toward another person the same verb becomes a curse that Japanese treats as genuinely serious, the kind of line that ends friendships. So keep it pointed inward, where it belongs.