Used to describe young(ish) people who should have moved out of the parental home but have refused to give up the easy lifestyle and perks that this entails. As a result this costs the parents in money and time.
Yeah, so does my bro. We got it sweet, we're kippers!
2. to split a fish and continue to salt, dry and smoke.
2: Fisherman: We're gonna need to kipper that fish something proper before we serve it to our girls.