Your boss' boss.
My boss just put in her notice, so I have two weeks to suck up to the grandboss before he decides who gets her job.
by Czebesque September 11, 2009
It was annoying to have to submit a TPS report to my boss and my grandboss. It's enough to make a dude blazy.
by smellyrock September 20, 2006
In the meeting, I had to deal with my boss, my grandboss and my great grandboss all of whom didn't know anything...
by Working peon April 15, 2011
Your grandfather was riding on a dick at two in the morning with your friend from down the street that has now turned into a GrandBoss
by PEWN May 14, 2013