Surely there's something in Japanese film. And some Western cases would be nice. I know I've seen this in non-Asian contexts, I just can't bring specifics to mind
Topic on Talk:Tongue Suicide
Hello? Hello? Bueller? Bueller?
I think I found one. According to Wikipedia, a character in Million Dollar Baby attempts this, but I haven't seen the movie so I'm not sure I should add it.
I found some examples, like hearing that we should check out Wuxia and probably shows and such that are influenced.
I found this site: http://www.wuxiaworld.com/ It's probably a gold mine.
In a Sons of Anarchy episode Otto bites his tongue, but I dunno if he committed suicide (I didn't put up an example. https://www.rollingstone.com/tv/lists/20-best-sons-of-anarchy-moments-20141208/otto-bites-off-his-own-tongue-20141208
Wondering if Hellboy and Buffy have something.
Found this: https://mondobizarrocinema.blogspot.com/2010/10/wtf-spain-killer-tongue.html
There's an alien entity living in her tongue.