a unit of measure, usually about a workload used to legitimize the obscene suggestion that there is a "ton" of work to use the metric system emphasizes the sheer mass of the workload
Mike: so, u wanna hang out?
Chris: can't. i have a metric shit-ton of homework
Mike: that much? damn.
A metric shit-ton is a unit of measurement used to gauge how long your bitch-ass homework took you to complete. One metric shit-ton is equivalent to 4 hours worth of daily homework, excluding breaks and procrastination time.
I'm typing up this entry just to avoid doing my metric shit-ton of homework.