1) A heavy metal with several industrial applications.

2) Something, normally musical, that can be described as very heavy.
I saw motorhead last night and Lemmy's base sound was just osmium.
by black flag June 1, 2004
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1) A hard, brittle, bluish-white metal. It is the densest (heaviest) naturally occurring element of all known elements, with a density of 22.59 g per cubic cm.

2) What to call someone who looks seemingly skinny, but actually weighs a ton.
1) Did you know that Osmium was once used in phonograph needles?

2) Yo look at that Osmium over there. She may look lean, but I heard she weighs 200 pounds!
by UltimateDoge October 19, 2019
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Element #76 with the symbol Os, a.k.a. the bluest metal in the world. Although it might seem pretty, Osmium is far from being good jewelry or building material, unless you want things with unbelievably high costs. It's a relatively non-toxic substance, granted that you don't combine it with Oxygen. Its name comes from the Greek word "Osme", which means "smell", "scent", or "odor". This definition refers to the nasty volatile compound that occurs when you mix Oxygen with the latter. It's also an extremely heavy metal, weighing 5x more than Lead does.
Osmium is the heaviest, stable metal in the universe.
by CHNOPS July 9, 2020
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The length of time in which your girlfriend's gay roommate can do whatever, whenever, to your mouth, cock, ass, balls, and shaft and you can't tell him to stop.
Damn Stephen, can't wait for you and Adam to Osmium.
by cunds002 March 21, 2018
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The densest known element used to roast the density (stupidity) of your fellow peers.
Dude, Tony was so Osmium when he ran into that door!
by Cena Senior March 4, 2021
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