When an individual is typing a text message and inserts a facial expression text, while simultaneously making the facial expression themselves.
Steve texts, "we ran out of milk and now i cant have it with my cookies :-( " while texting, Steve is actually making a sad facial expression. The act of Steve texting a sad face while making a sad face is a texpression
the expression one gets while reading a text message
Jess: hey did you see Lisa's texpression when her bf was breaking up with her over text?? priceless!
Hannah: i know friggin' hilarious!