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1.
When a person who normally spells everything correctly, using proper grammar and punctuation, decides to send messages that heavily use slang, shortened spelling (u instead of you,) and little if any punctuation so the person they are texting will stick around long enough to get to know them.

This is commonly used by men who are trying to get with woman who are attractive, but are not interested in men who come off as nerdy, proper, and useful to society.

ILLITERATED DEFINITION: w3n dey talk l1ke a c00l p3rson
I used the example for illiterated texting in the definition
by Optical_Epilepsy March 16, 2011