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Twitxting is an amalgamation of 'texting' and 'wit' and is reserved for particularly clever dialogue, usually involving flirting with the opposite gender via SMS text.

The second "T" is silent. Pronounced "twicks-ting".
That was high quality twitxting when you were talking to that girl from last week. That should have been a stand-up comedy routine!
by UncleBarney December 07, 2010