I have no idea what kind of company you work for, but if everybody already appreciates that you have a severe stutter, why not have some fun with it? You could answer with: Yo! Yo! Yo! (3x not because you stutter but because that’s how you roll ;-) What’s up? I used to throw this one out at older upper management types every once in a while, and it would throw them for a loop. Good morning, Vietnam! Because you’re channeling your inner Robin Williams. Or anything else that you can think off that would lighten the mood. I can think of many other suggestions, but I’m not terribly politically correct so I should probably quit while I’m ahead.