The “How to exit vim” repository contains many “weird tricks” for exiting Vim.

the easiest way

:!ps axuw | grep vim | grep -v grep | awk '{print $2}' | xargs kill -9

The Python way

:py3 import os,signal;from subprocess import check_output;os.kill(int(check_output(["pidof","vim"]).decode
('utf-8')),signal.SIGTERM)

Pure Perl way

:!perl -e 'while(</proc/*>){open($f, "$_/cmdline"); kill 9, substr($_,6) if <$f> =~ m|^vim\x00| }'  

Mac Terminal

Press ⌘+q > Click Terminate