What is the term for singing in a false low register?
It isn’t quite the same thing but I believe the closest thing would be the so called chest voice.
I have never heard of singing in a “false” low register. I don’t suppose you could cite an example?
Death growl, perhaps?
ETA: Hmm, after checking wikipedia further, perhaps vocal fry is the correct term.
Basso Profundo, I suppose.
Seen/Heard it in Buddhist monk chanting in “Seven Years in Tibet” last night, and previously in “The Golden Child,” which also featured Buddhist monks (or something like that). Sounds like an impossibly low note, like ~30 Hz or something, a really low concert B-flat.
Yip, you’re probably talking about vocal fry. It’s a natural part of most people’s voice, when you drop too low, like at the end of sentences. It has a kind of clicky sound to it.
NETA: This video includes it on the very last note, if not once earlier on. As mentioned in the comments, it’s a classic technique, still used with Russian basses.
I personally can only do it early in the morning, when my natural voice can get low enough, as they aren’t lubricated. I mean, I can fry at other times, but it sounds really weak.
I guess I’m not sure what I mean. I figured there was a musical term for it. Like when I get drunk drunk and sing with Freddie Mercury it’s Falsetto. And when I get drunk and sing with yellow , Oh yeah, I thought there was term for it
Well, record yourself sometime, and I’m sure you can get someone here to analyze it 
Maybe you mean Tuvan throat singing? There are some links at the bottom of the page to samples.
I can do what the OP is saying. It’s not very musical (I’d say a range of a fourth - if that much) and hell to control.
I sing Basso Profundo (I can hit that B-flat in Rachmaninoff’s “Vespers”). And it’s only the bottom few notes that sound grainy, not my entire range.
If I’m getting over a cold, my range is scary.
If you listen to the end of “Emotions” by Mariah Carey, at the very end, she goes way down and hits a very low note