It comes from LifeTeen. In past years, they used a dismissal that went something like, “The Mass never ends. It must be lived. Go in peace, etc.” In the past couple of years, the Vatican asked them to make some changes to bring the LifeTeen Mass into compliance with liturgical norms, and this dismissal was removed. However, there are some priests and deacons who think this dismissal is “pretty cool,” as our previous poster did, and continue to use it in defiance of the norms.
It really grates on my nerves when one of our deacons does it, so instead of “Thanks be to God,” I reply, “Whatever.”
Betsy