My husband keep saying "Like a boss" everytime he does something. How can I make him stop???

You cant make him stop he won't
(Sorry had to) xD

Get him demoted.
C:

Or make him a bagel, your choice.

Don't tell anyone, but I saw him hitting on his co-worker. e_____e

...

you can't

Haha my boyfriend says that all the time too:D
This is what I would love to do:
I laugh and then purposefully spill his soda. And while he's whining and groaning, I whack him on the head and say, "That wasn't 'like a boss', David. Not at all. Mission failed."
:D yeah, I'm pretty mean:D

giving advice like a boss tell him to stop like a boss