Essentially instead of pasting all the text from your clipboard, it will type out the contents as though the letters were typed on the keyboard. One by one. This allowed me to "paste" into VMs and other places that I normally couldn't.
The ol' google gave me nothing but "How to paste into terminal" posts which is not what I want.
Pipe your clipboard contents through either of those depending on your windowing system. I'd recommend putting that in a script and binding it to a keyboard shortcut.
I'm on Wayland these days, but if you happen to be using X11 this is the homebrew solution I used to use:
xdotool type --delay 50 "$(xclip -o -sel c)"
The --delay argument specifies the delay in milliseconds between keystrokes; if you go too low on that it tends to break things.
Interested to see what solrize comes up with because this method definitely has drawbacks -- no way to interrupt it and if you accidentally paste something large it takes a long time to finish due to the forced delays.
I've never really had the need for a Wayland version, but I don't see why subbing ydotool for xdotool and wl-paste for xclip wouldn't work.
If you pasted something long, you could possible switch to a terminal (ctrl+alt+f2 or something), and kill the process.
Or you could grab another machine, and ssh into yours to kill the process.
I work around this by enabling rdp or ssh on guests as soon as possible and connect from my terminal for ssh, I use remmina for rdp, paste works there.
I don't know other situations where I would need this.