urban bullriding 

similar to bullriding, but with people. most commonly practiced in urban areas, an urban bullrider will mount (jump on) a suitable and unsuspecting candidate, and ride them for as long as possible

Me and Chris did some urban bullriding in london. I jumped on this huge dude on the millenium bridge and rode him for at least 12 seconds.

urban bullriding by missy ingham November 1, 2010