Donzo means done. Finished. Retired.
Obviously it came from the word done. Zo is just the way girls and guys add stuff to the end of a word. example: gonners? Same thing only zo.
Dude, Kevin and I are totally donzo.
Our relationship is donzo.
Dick Butkis is donzo.
guys that are obsessive with their shoes.
Look at the group of shoeboxes over there, They used a whole box of q-tips on one shoe.