When an individual (knowingly) counterfactually attempts to prove a statement or theory to be wrong or false simply to be difficult or contrary.
Person #1: I've just had a someone trying to tell me Elvis, Princess Diana, MJ & 2pac are not dead, but are lizard people that have returned to living in a secret bunker on Mars and ruling the Earth remotely VIA Donald Trump...
Person #2: Sounds like you've been Sheloff'd pal.
Person #1: Yeah, you're probably right, they were probably just Sheloffing me. No way they could believe that nonsense.
ditching. It usually applies to ditching school but it doesn't have to.
Use of the past tense is okay too, for example sloffed.
We went sloffing today during fourth period.
I sloffed 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 sloffing.