What exactly is \context Bottom?

I  got it in a function originating from a suggestion by David Kastrup:

\version "2.19.45"

% Thanks to David Kastrup for the inspiration!
after =
#(define-music-function (t e m) (ly:duration? ly:music? ly:music?)
   #{
     \context Bottom <<
       #m
       { \skip $t <> -\tweak extra-spacing-width #empty-interval $e }
     >>
   #})

{ \after 4 \< \after 2 \> \after 2. \! c'1 }

but I can't find any documentation for a "Bottom" context.
I have an idea what it is, but would like to have a real explanation.

Best
Urs

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