not holding on to anything while riding the subway train, when the train turns, stops, goes etc. you get jerked around and have to "surf" to maintain balance
derived from the natural position your body takes in order to maintain an upright position
can be both purposeful or accidental (e.g. children are often urban surfing for fun, while adults are forced to urban surf when the trains packed)
The other day these two kids almost knocked me over because they were urban surfing from 110th to 96th. Nobody can survive those rickety turns when the train cuts through the park!
The ride to Coney Island was so long that we were urban surfing just to pass the time.
Urban Surfing is riding the Detroit inner city bus or any other large ghetto where you are pack in ass's to elbows, everyone has to standing and the bus drivers drive totally fucking nuts!
I got a DUI and now have to urban surf to work. Man, I have gotten in two car crashes this week, while I was urban surfing.
Taking a board of some kind (eg. body board, surf board) just after it has rained heavily and using it to surf across the areas of parks, backyards, golf courses or any urbanized locations where there is enough water for the board to skim across with small amounts of kinetic energy, usually created by running up to and jumping on the board.