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!