Itīs a very old "nickname", i think from around 1988.
It became necessary, because also in this "old days" without internet (for me) i donīt wanted my
real name on any data medium.
TWC is the synonym for "The Wild-Cats", a US-baseball-team, i like how the words sound,
besides i like every kind of cats. And the "Werner" is from a german comic, looks like this: