1) A person with an abnormally large penis
2) The Japanese singer Gackt
1) Yeah, I slept with that guy last night. He was a real magnum!
2) When asked about his penis size, Gackt replies 'I'm a magnum."
by Random Person from Canada May 30, 2005
The condom you can't fit in.
'Yer only five inches... this won't work... you can leave, Brett.'

'My arm... it fits in the magnum... that's sick...'
by EddyMiddayMeetsFellony June 05, 2009
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
A cartridge which is more powerfull than a normal round of the same caliber, or a gun made to fire such a round. As there is no precice definition of what is a magnum round and what is not, the name is up to the designer.

Magnums are most commonly used in revolvers, but are also used in semi-automatics and rifles.

Magnums, while powerful, will not "blow somebody's head off" or kill anybody with a single shot. As with all rounds, they will not kill except by central nervous system damage or by blood loss. While a magnum round will most likely cause more damage than a non-magnum the location the round strikes has more effect than anything else, and even a round to the chest should not be assumed to be a automatic stop. Look at Richard Blackburn, who was shot five times in the chest with a .357 magnum, but survived and returned fire, killing a South Carolina state trooper, Mark Coates, with a .22LR handgun.

There are many magnum rounds, but some of the most popular include the .357 magnum and .44 magnum. Also worthy of note is the .460 Wetherby Magnum, a _very_ large, powerful rifle round for large game hunting.
A .460 Wetherby Magnum will stop anything it can hit properly. It is what you use if you want to hunt an elephant.
At the other end of the scale is the .17 HMR, which is only very effective against fairly small animals.
by .460 September 06, 2006
40oz bottle of malt liquor
they only had only enough magnums to get me drunk
by mikey magnum February 13, 2009
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
1. A large bottle of cheapish wine, 1.5 liters in capacity. Sometimes also known as a bomber to the less snobbish.
2. A heavy-duty handgun. Strongly associated with Dirty Harry.
3. A large condom manufactured by Trojan. If you can't fit your boy bits in a tp roll, buy these instead.
We bought a magnum of Hardy's Stamp at the store, and after a couple of hours with that she made me get out the Magnums. Hey, what can I say?
by connorbd@yahoo.com October 24, 2006

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