Person 1: "Oh, fuck, now I know what you mean: It's called 'parkour'. It must be French for 'being a dick' or 'being a wanker'. I get my French nouns and verbs mixed-up sometimes."
Basically, its getting from point A to point B as fast as you can. This would involve vaulting over rails, running up walls, jumping long distance, etc.
Some guy took my wallet and started running, so I did parkour to catch him.
An activity for arrogant idiots who show no concern for the general public at large. Usually involves trespassing into someone else’s private property, and performing some asinine string of stunts until severe injury or death. Similar to skateboarding, but with no skateboard, so is therefore utterly pointless.