First used on cricket video when hit 4 or 6 in appreation of cricket shot.
When you win argument. Duzz duzz
Usually spelled "doinmyduzmy".
Meaning I'm doing my own thing. I'm doing me.
Also said,"domyduzmy"
Don't worry 'bout me, I'm doin-my-duz-my.
I'm gonna domyduzmy no matter what.