the awkward exchange that occurs when two people who are walking towards each other move the same direction (usually more than once) to get out of each other's way
It's hard to avoid staggling with other pedestrians when walking on the crowded streets of London.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.