Dutch Nod

When you are out in public spaces, (most often your local farmer's market and/or auction, diner, luncheonette, or fire company social quarters) somewhere in south central Pennsylvania, and you notice you are being watched by an old man who does nothing more than give you a barely perceptible nod (perhaps squinting a bit as well), letting you know you are "O.K." and accepted.

"hey man you sure we are gonna be ok walking into this place? It looks rough."
"Yeah man, that old dude gave me the Dutch Nod walking in"
"Really??? That guy gave me the finger!!"
"Well then.... you're fucked"