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1.
another form of public transport commonly used in the city of sydney.
ryan: dude, we just missed the 12:07 bus! were totally fucked for our physio appointment.
dale: chill out man, we'll just take the next fun run that comes along.
ryan: look, here it comes now.
by cannas™ August 08, 2008
 
2.
When shutout in beerpong, the losing team must run around the entire house naked after drinking all of the other teams cups.
by japhet October 30, 2003
 
3.
A random running sessions that begin when someone yells "fun run!" At which point, everybody takes off their clothes and starts running in no particular direction until yelled at by someone who isn't participating in the fun run.
"Hey Norsoph, let's start a fun run."
"Fun run!"
"Hey, are those guys in a fun run?"
"Look at me, I'm in a fun run!"
"A guy walks into a bar and...FUN RUN!!!"
by Party Boy May 31, 2004