1 definition by Endlesssummerduo
When a bunch of instagrammers jam a sidewalk or set of stairs, usually in a tourist area, posing for pics with total disregard for everyone else trying to use the walkway.
I pushed through the crowd on the viewpoint stairs to find an instajam of girls posing. After I got past the instajam the stairs were totally empty.
by Endlesssummerduo June 12, 2022