Large, made-up words that architects and designers use to make themselves sound smarter than you (you being the client or the confused observer of design). It does nothing to inform or enlighten the consumer of architecture and mostly serves to numb them into obedience or self doubt.
"I went to Rem Koolhaas' lecture last night."
"What did he talk about?"
"I have no idea. It was all in archispeak. Either I'm stupid or the guy is brilliant!"