An item is used that hinders the functionality of offensive Pokemon.
This could range from Leftovers making defensive Pokemon mote difficult to break to Shed Shell messing with trappers to Black Sludge messing with Trick users. This could also apply to things like Trick + CB Bronzong.
Oh yeah, I have some qualms about you saying that a Pokemon is 'abusing' an item. 'Abusing' has a negative connotation and isn't really the right word to use for what is essentially "a Pokemon utilizing an item to cripple something". Obviously that's superfluous, but using "abuse" sounds weird to me. idk, others might think differently.
Your example team seems kind of strange too... you probably want a spinner over Espeon because both of your sweepers are so ridiculously hazard weak thus you need the reliabiliy, and I don't see what Whimsicott does that say Sableye cannot (so fix that). That team is also weak to a ton of stuff, but I won't get into that.
This concept itself is interesting, and I'm interested to see what can eventually come out of it.
C&C Work | 1k RMT | Contribute! | VM for an OU Rate! | gp member: vm/pm for a check | previously pokemon0078 / aka jew-cane