Never Seen Official's Penalty Signal

[Rolling Wolf]

Our intercom system for the White Cap was out last night so explanation of penalty could not be heard through the speaker system and we could not even hear on the sideline. Thankfully both times he called it, it was against our opponent and their sideline acted as if he was insane. Can someone tell me what this penalty signal is for; he places both fist together on his sternum of chest and pulls them apart as if he is pulling open his shirt, like Cam Newton does with his Superman demonstration?
New one on me and I've been coaching football for a long time. I can not find it on any illustrations for official signals. In North Carolina by the way, I'm not sure if it is state specific.