godan verb (-nu), intransitive verb
Only when written 氏ぬ
Jocular internet slang; a deliberate misspelling of 死ぬ using the homophonous kanji 氏. Used playfully or ironically online, not in serious contexts.
See also: 死ぬ
このバグのせいで氏ぬ。
This bug is killing me (jokingly).
After all these all-nighters I seriously feel like I'm gonna die (slang).