Used in the context of an online chat room, social media site, email, or other online social communications, CTADR is an acronym for "Capitalization To Annoying, Didn't Read". This is usually said when someone unnecessarily types each word in a sentence or paragraph with the first letter of each word capitalized. In the context of an online forum, this can often literally mean they didn't read it.
"What U Doin?"

"CTADR."
by MasterLlama August 07, 2012

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