plant it outside somewhere, so when your fems are mature, you can pollinate, plus you'll have a huge male, something not too many of us have seen firsthand
If you decide to kill it, just cut it up and spread it in your garden, or run it over with a lawn mower, dont just put it in the trash, once you put trash out for collection, you lose your intelectual and property rights on it E.G the trash man might see the dead mj