A phrase used to describe the state of actively texing people. This can also show in the case of someone being unresponsive whether they are ignoring you or they are unavaliable.
Dave: Why hasn't Emma responded to my text yet? It's been 30 minutes!
Jack: I don't know, she might not be textually active. Wait a second, I'll check...
* Jack texts Emma something*
*Jack has one new message from Emma*
Jack: Yeah she's textually active/ignoring you