Your boss's boss.
I was supposed to get my raise 2 weeks ago, but my boss told me my grand boss is holding up the process.
by Keith Mac August 07, 2010
The boss of your boss.
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 Rollie Hatch September 20, 2006
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 10, 2009
A sexy man who has gay sex with grandpas that are above the age 90.
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 13, 2013