The feeling described when a conversation happens in slow motion via technology. Usually only occurs with e-mail, but can also occur with texting or IMing, if neither are ever there at the same time.
Jane: Hey! Haven't seen you in weeks! We should hang out!
Jack: Totally! Tomorrow would be cool, have you seen the new James Bond movie?
Jane: Oh. Sorry i missed you the other day, but sure, the Bond movie would be fine.
Jack: Dude, that movie just left the theaters, we are suffering from a major case of techno-lag.
Jane: For sure.