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."
When cleaning out the bathroom at work this morning, there was some straight gnarage in the toilet and on the wall. Suprised there wasn't an organ in the toilet or dude didn't pass out...there was a lot of blood