ditching. It usually applies to ditching school but it doesn't have to.
Use of the past tense is okay too, for example sluffed.
We went sluffing today during fourth period.
I sluffed it during the chemistry test because i didn't study.
I really wanted to go to the beach today but i couldn't because i had to work and i didn't feel like sluffing.
More endearing than most derogative terms for skanks. Used when you want to piss someone off and call them a name but you still love them. If they are a skank and need to be reminded sluffin probably wouldn't offend.