When a prospective member of the opposite sex texts you in regards to dating and you have high hopes for the incoming text.
Dude! Taylor texted you about going to the bar tonight. Ahhh, I don't know man I really like her. What did she say? I have high textpectations for her?
At the point where a text message is sent to someone there is an expectation to receive one back, this wait...usually long and painful is known as the "texpectation"
I really hate having texpectations sent on people, because if they don't answer me...I feel clearly ignored.