Short for garbage, trash, etc, used in Gen Z Lingo to say something is garbage without completely saying it.
A tier below "garbage" , can be used for almost anything to describe your inner gut feeling of absolute disgust.
Eg. "Kebabs were Garbos last night" or "So, I waited 50min for her to put on make up and when she rocks up,.... GARBOS"
Garbo has two meanings, its either an insult or a compliment
Jason: Ay bro you looking real garbo today
Joe: Thanks?