gaijin nod
A head bob between two clueless foreigners in Japan who see each other on the street. They don’t know each other, but they both feel like aliens and nod at each other like they’re saying, 'Bro, I feel your pain.'
I saw two Americans nod at each other in Tokyo like they were best friends.
A German and a Canadian nodded at each other in Osaka like they were planning a heist.
Two Australians nodded at each other in Kyoto like they were silently judging the local ramen.