Arguably a synthesis of "invaded" and "devastated", or perhaps a combination of the latin root vastare with the prefix "in-". The word's first usage was coined by a Cambodian attempting to describe the imperial conquest and destruction his native land. It is now a permanent addition to Pidginized English, and is in widespread use in Asia-Pacific.
verb - the action of someone online who signs into a chatroom and stays inactive for a longperiod of time so that everyone in the chat believes that person to be away from their keyboard, but as soon as someone says somethign about them or speaks about a topic that they have knowledge about they pop into the conversation. this can either be referring to a good friend or a frequent visitor who is annoying.
person #1, "hey man did you hear about Gilly?"
person #2, "no i didn't, why, whats up?"
Gilly, "did someone just say my name?"
person #1, "goddam it gilly you fuckin invisibated me again you dick!"
Gilly, "LOL -.-"
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.