Running a marathon:
When you become extremely intoxicated off of Captain Morgan and pass out in someones trailer. Then you are awoken by friends 3 hours later and go snowboarding. This is known as "Running a Marathon."
So if you've never run a marathon, but want to be able to say you have in your social circles, go to the liquor store on Friday, find a trailer park, tell your friends where to find you 180 minutes later and head for the hills for some mountain surfing (also an UD term).
Personally, I'd rather run the 26.2 painful miles than indulge in this crap, but that's just me.