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1.
To be busy responding to or initiating multiple SMS (text) messages.
Brooklin was multitexting with so many people it took forever for her to read and respond to my message.
by snowplow September 28, 2007
 
2.
When you can text and do things at the same time
"God Jamie I can't multitext. Ask me when I'm done!"
by Julu December 03, 2009