To be taken away by spooks within the government such as the CIA or FBI and either secretly killed or taken to one of the secretunderground prisons operated by them.
"When we last saw Jim he was attending some anti-war rally. That was 2 weeks ago. I think the government disappeared him."
When someone claims to just go for a piss but never comes back.
Penny was wondering where George went when Tom said he just went for a piss. Joe pipped up and said “ that was 30 minutes ago! “ Bear remarked “I guess he just pissapeared”.
When you have to bail out of an e-mail or textsession with a "friend", because of a prior commitment with a spouse or significant other....usually resulting in the other party thinking you bailed on them.
Dude, what's with the dissapearing act??
Sorry man, the boss had me tied up cuttin the yard for ever.....