The adjective 'metric' defines a unit of measurment that is included in the Internationl System of Units (SI).
All countries except the USA, Liberia, and Myanmar use the SI and it is furthermore the only system of units used in scientific work.
Hihi I'm some Canadian chick and the only metric I know is some dumbass band.
Ooooh look at me, I'm dumbassly defining metric as 'even more than'...how awesome is that.
Bad in the sense that something has gone awry, or that someone has caused something to go awry; Messed up.
Bob - "Hey, did you just hit that guy in the face for no reason?"
Steve - "Yeah, so?"
Bob - "That's pretty darn Metric of you."
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Comparing the Metric and Secondary (Or standard as some call it) measurement systems in America, we find that the majority of people are more familiar with Secondary, and as such 'Metric' is awkward, different, bad, or crazy. In this sense, 'Metric' can be used to describe the attitude or actions of a person, or something else that has happened that was unintended and harmful or unwanted.