free running 

Running whilst in one's birthday suit. If a man, the shlong and scrotum swing freely in an agreeable and satisfying way.

The old man enjoyed free running across the country.

free running by greyshark7 March 14, 2007

Free running 

When someone participates in a race, but they make no donation to the cause it's representing.

Person 1: Did you hear about the guy who was free running in that cancer research race?

Person 2: Yeah. It's terrible when people don't give back to a cause.

Free running by MinxFan2016 August 1, 2018