There were several internal Boeing acronyms that may not have gone over well in general use. My favorite was "Airborne Integrated Data System" - AIDS (basically an aircraft level health monitoring system) - this in the late 1980s at the same times the Acquired immunodeficiency syndrome was a big concern. As my groups focal to the (Boeing) AIDS team, I was a little reluctant to tell people outside Boeing what I was working on...
The other really good (i.e. bad) one was "Boeing Delegated Organizational Authority" - Boeing DOA. That one was so bad management promptly changed it to "Boeing Delegated Compliance Organization" - BDCO. BDCO became a sort of four letter swear word to those of us who had to regularly deal with it, but at least it wasn't embarrassing...