The adventures of captain janeway
Captain Janeway discovered a very highly advanced civilization in the Delta Quadrant and was invited to beam down and meet an ambassador. As she and the ambassador discussed many things, she noticed that servants would always tap their bellies when entering the room. She asked what the meaning of the gesture was and the ambassador replied, "That is what we hold as our one abs salute."
If you want to pick THAT type out of a crowd, just look for the festering scabs on their elbows.