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2.
Used N(Textmate)2or more person sharing, exchanging & forwaring SMS on a continues spand of time.Used as ADJ.2or more persons sharing, exchanging and forwarding Intimate SMS on a continues time frame.
As a Noun:

Cris and I are textmate since June. We offten exchange inspirational messages to each.

As an Adjective:

Cris said I love you thru text even we haven't met. He is just my textmate
by kukie August 19, 2006
 
1.
n. condition or situation where after texting another for hours and all topics have been thoroughly explored, no further texts, acronyms, emoticons, etc. are possible.

After text partner divulges unimaginable news to which one cannot respond. Akin to checkmate in chess.
I texted Matt for six hours last night, til we had nothing left to say. I was like textmate! I'm going to bed.
by KK-shuffle December 30, 2012