ConTeXt: Use of t-vim module in table

Since t-vim is built on top of t-filter, you can can use the \process<filter>buffer command to load an existing buffer:

\usemodule[vim]

\definevimtyping
  [somecode]
  [lines=split]

\definevimtyping
  [RUBY]
  [syntax=ruby]

\starttext

\startbuffer[ruby]
# Ruby program listing
print("Hello World")
\stopbuffer

\startbuffer[somecode]
test code
more lines
\stopbuffer

\bTABLE
    \bTR
        \bTD
          \processsomecodebuffer[somecode]
        \eTD
        \bTD
          \processRUBYbuffer[ruby]
        \eTD
    \eTR
\eTABLE

\stoptext

You could alternatively use the module ntb-to-xtb, which lets you use xtables with natural table syntax (in other words: this lets you use TeXnicians solution without changing the code):

\usemodule[vim]
\usemodule[ntb-to-xtb]

\definevimtyping
  [somecode]
  [lines=split]

\definevimtyping
  [RUBY]
  [syntax=ruby]

\starttext

\bTABLE
    \bTR
        \bTD
\startsomecode
test code
more lines
\stopsomecode
        \eTD
        \bTD
\startRUBY
# Ruby program listing
print("Hello World")
\stopRUBY
        \eTD
    \eTR
\eTABLE

\stoptext

The output for both solutions is the same:

More of a comment than an answer: With xtables you may use verbatim material directly.

\usemodule[vim]

\definevimtyping
  [somecode]
  [lines=split]

\starttext
\typebuffer[visit]

\startxtable
    \startxrow
        \startxcell 
\startsomecode
test code
\stopsomecode
        \stopxcell
    \stopxrow
\stopxtable
\stoptext