Like quicksand, but in the context of texting. AKA virtual quicksand. A metaphorical state where things have gotten out of control and one starts to panic at the thought of the predicament they have gotten themselves into, from texting.
Texter 1: Hey
Texter 2: Hey
Texter 1: Wanna come over?
Texter 2: Now? It's 12:30 am
Texter 1: Yeah. I had a bit too much wine
Texter 2: :) Ok

And even through the blurry haze of a good buzz, the regret and panic starts to set in. Oh man, I'm in textsand now.
by AH73 November 12, 2013
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