A bumbling lump, knuckle dragger, buffoon, or chucklehead, meant as a combination of garbage, bozo and
gorilla, a concise way of calling somebody a
big dumbass.
Garboza: Ahh, sorry boss, I
busted another chair...
Boss: You god damn garboza you, that's the third
time, should I get you a crane instead? Lay off the fried
chicken!