1) A handgun.
2) A popsicle brand sold in some parts of the world.
3) A brand of condoms- extra large.
4) A nickname for Japanese singer Gackt who once, when asked about his penis, blurted out he is a "magnum" on national TV.
1) He shot his girlfriend with a magnum.
2) I love double caramel magnums but they're so fattening!
3) He is hung like a horse- he only buys magnum condoms.
5) Is that a crease in Gackt's pants or is he just happy to see us?
by shame_shame_shame August 30, 2005
The largest condom available for men who pack extra down stairs.
During my Oracle training, Brad's magnum created an enormous bulge for the Oracle team to see.
by Spurlin July 30, 2008
An incredibly powerful handgun
Ah ah! I know what you're thinking punk. You're thinking 'did he fire six shots or only five?'. Well, to tell you the truth, I forgot myself in all this excitement. But being as this is a .44 Magnum, the most powerful handgun in the world, and can blow your head clean off, you'd better ask yourself a question. Do I feel lucky? Well? Do ya? Punk!

(Loud gunshot)
by Snake July 18, 2004
Usually a really big condom
You know I need the Magnum for my ish.
by G.O.A.T. November 24, 2004
A scrawny kid with a huge wang. A Magnum usually plays pansy "sports" like ultimate frisbee and bowling. Don't expect to see a Magnum out around the town at night because they usually go to bed at 10pm. This is because they are so tired from having to lug that huge mangina around all day. Even though Magnum's have large love sticks they usually strike out with the ladies, coming off as cocky and annoying. The cockiness usually develops from their knowledge that they are more "man" than the average joe.
"Really Magnum, put that thing away!"
by frisbeeisforchumps October 28, 2009
A round with a greater amount of propellant than a standard cartrige or the wepon that fires this ammunition. Named after the largest size bottle that champagne is sold in (almost 1/2 gal.)
The standard way to describe a glass bottle which holds 50.8 fluid ounces of champagne. A regular bottle of champagne holds 25.4 ounces, therefore a magnum contains the same amount as 2 regular bottles.
I was going to get a bottle of champagne but decided to get a magnum of champagne instead because more people are coming than I expected.
by z July 20, 2004