That friend that always sends you a meaningless text after the obvious end of a text conversation, just to get the last text. They do this while totally oblivious to their uncontrollable habit.
OMG, Jan is SUCH a last texter it drives me crazy. The other day, she sent me a text "K" back after I texted her "don't text me, in a meeting." So then I had to dig out my phone again to clear it so it wouldn't keep vibrating for the rest of the meeting!