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Re:Ox is a fast text editor, written in Rust, that runs in y... by tzs on Tuesday November 03, 2020 @06:23AM (#24978598)
In addition to being an insert mode command as jshholland already noted, it is Ctrl-x Ctrl-f, not Ctrl-x f.

Here is a description of it and a few other insert mode commands: https://georgebrock.github.io/talks/vim-completion/

Re:Ox is a fast text editor, written in Rust, that runs in y... by e12e on Tuesday November 03, 2020 @12:18PM (#24981639)
Fascinating. These ctrl-anything is like a dangerous, crippled emacs lurking in a dark corner of my beautiful vim, ready to terrorize with keyboard coords over modes and commands ;)

I've bound some complete-plug-in to tab, but that's pretty much all I do in insert-mode command-wise.