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A person who, when texting, almost always has a smile on their face and appears to be in a good mood even if they aren't.
Sandy is always smiling when she is texting, I guess she must be one of those Happy Texters.

I saw Chelsea smiling white she sent you that text, but don't get your hope up, I think she's just a Happy Texter.
by PattyBadFingers December 13, 2009