Combination word Gnarly (as a negative connotation) and Garbage. Can be used in place of the actual word garbage. Or it can be used to describe unsavory things or situations.
“This party is gnarbage.”
"I'm taking out the gnarbage."
"He's a gnarbage collector."
A set of breasts (or occasionally one breast) on a woman that are distasteful or awful in quality - be it in shape, size, color, or texture.
Yikes! That troll over there eating garbage has quite a set of gnar bags, I think they are inducing the premature birth of my child. Whoops! Its a still-born. Thanks troll.