That´s gotta be the best definition I ever saw on Urban Dictionary, one of my preferred sites:
An awkward situation in which two pedestrians, who are on a collision course with each other, are repeatedly unsuccessful in averting one another. As one person moves to their right, the other person moves to their left and vice versa. Each time they attempt a new maneuver, the frustrated pedestrians find themselves confronted by their counterpart. To the casual observer, these two people may appear to be dancing, but in reality, they both just want to get on with their lives.
These encounters are far less common in Europe – especially in Germany, where the government enforces pedestrian decorum through a stringent "bear right" policy. Pedestrian face-offs have been known to last upwards of ten seconds.
Randy: I just had a pedestrian face-off that lasted a good 15 seconds. In the end, we came to the mutual agreement that both of us should step to our right.
Dina: Wow, 15 seconds?! That's gotta be a world record or something.