A significant other who is a live in partner. A domestic partner. A name you give someone who is more than just your boyfriend or girlfriend and not quite your spouse. Con~ latin for with; vivir~ latin for live.
My convivant and I share a home with our two cats and a roomate.
a person of poor or hoodish taste; any general hoodlum, who may or may not appreciate the shittier things in life, especially those things that those of refined taste look down upon (like fart jokes, Nextel cell phones or walkies).