1. Military and/or specifically Marine Corps slang typically meaning one is delegated with a ridiculously easy task or is having an easy day.
2. Missing all of the hard work.
> Private first class: "Be glad you weren't here yesterday, they made us clean the porta jons all day long."
> Corporal: "yeah I was skatin."
> "Sergeant Smith is checking out of the unit, he's skatin today."
> "Private Prod has three days off when everyone else is out in the field." (Skatin)