“Tongue-jutting,” where the tongue is forced out of the mouth is used when people think they have gotten away with something, or have been caught doing something they shouldn’t have. The statement reads “I’ve gotten away with this”, “I’m telling a cheeky joke or making a cheeky statement”, “I’ve made a mistake” or “I’ve been caught trying to pull a fast one.”
Tongue through the lips or teeth can happen any place at anytime but signals the same thing almost everywhere. It says that a person is doing something that is pushing the envelop of acceptability or has gotten caught doing something that is unacceptable. Obviously if we notice this tongue language we should review what has been said and suspect highly that we’ve been fooled, cheated, that we or someone around us has been made the butt of a joke, or that the tongue protruder has realized that they themselves have made a mistake.