Textpectation refers to the anticipation one feels when waiting for a response to a text message. 

“短信期待”指的是在等待短信回复时焦躁不安的过程。

Example:

I just texted her for a date - but now the textpectation is killing me.

我刚刚给她发短信邀她出来约会——但现在我的“短信期待”快把我折磨疯了。