I know these people...
...well, not personally, but I know the kind of person that comes up with these ridiculous neologisms. Anyone who has worked in the commercial IT sector (or any of its offshoots) will have met them. They're the kind of people who try to "proactively leverage synergies", who are obsessed with "getting our ducks in a row" and who will, with nary a by-your-leave, speak of "mobes" and "lappies" (yes, those).
OK, so I know that languages are organic things that grow and evolve over time, but there are some new words and phrases that really do deserve to become the linguistic equivalent of the weird and short-lived critters that appeared around the time of the Cambrian explosion. In fact, "smexting" (and its ilk) is probably even more maladapted than Hallucigenia at al and should, therefore, retire to a quiet corner and die immediately.