A group (or at least two people) of people, strangers towards each other, who can automatically finish or complete an appropriate response to a statement /phrase.
When I sing/chant out loud : "Teenage mutant ninja turtles... heroes in a half shell, "
Then you say (auto response) : " Turtle Power ! "
That's a situation we call
Geofunky.
Or
" ozzie ozzie ozzie"
"Oi oi oi"
