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1.
A term used to define a person who, for whatever reason, cannot figure out how to use Twitter.
I sent a direct message to my friend instead of replying to him because apparently I'm illtwitterate.
by Wildcat 91.9 Sports Guy March 26, 2009
 
2.
The circumstance in which you cannot comprehend the lingo associated with Twitter, or navigate the website.
ex. Joe: Wow, I can't believe it... he just RT'd me!
Jill: What's a RT?
Joe: Damn, I didn't know you were so illtwitterate.
by rochenmc October 23, 2011