Riding on the Washington, D.C. Metro (underground, subway) while not holding onto anything, hence giving the sensation that you are "surfing" in the car on the tracks, trying to stay upright while the car twists and turns.
Source: my friend Tara, who lives in DC, introduced me to this term.
Metro surfing becomes that much funnier to watch when people have been drinking.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug