An aconym for Universal Machine Pistole. I weapon that fires a 0.45 ACP round at a RPM rate of about 500. Some would call this Slow for a Submachine Gun of the 90's, but when examined closer, the higher caliber of the slug makes the delay all the more worth it.
A 25 round stick magazine protrudes from the bottom of the gun's body and a small muzzle with grooves for a silencer sticks off the front.
Over all, a Wonderful weapon in Real life.
However, the Developers of games Like Counterstrike have Butchered the True nature of the Weapon and made it second best to it's baby brother, the Mp5.
(even so, I'll still use and WIN with my UMP)
1) That's a nice SOCOM silencer you've put on you're UMP 45.
2) 45 ACP: Finaly got a decent rampage with my UMP
by Wangston Hughes March 11, 2004
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Universal
Machine
Pistol

A sub machine gun developed by Heckler and Kosh, the same company that has made the MP5 series and USP.
Developed due to the low penetrating power(against armor) of the MP5's 9mm ammunition and high cost. In fact, in enforcement agencies the MP5 submachine gun is more expensive than a M4A1 rifle.
Also, in real life the UMP is much more easier to clean than the odd MP5 which needs special tools.
Overall, the UMP is much superior than its brother, the MP5. It has power, low cost, accuracy and reliability. Could you ask for more?
Visit http://www.hkpro.com/ump.htm for more info.

+ Don't judge everything on games like Counterstrike. Get a life.
by Target May 30, 2005
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Universal Machine Pistol

Developed by Heckler & Koch. 25-round clip chambered for .45acp.

Considered to be "an MP5 for experts". Considered by me to be "the modern-day Tommygun".
"The UMP is just a gun one can just fuck with in Counterstrike. It serves you bad, then it serves you good. It's a hypocritical gun it seems...so that's why I deem it as 'a gun you fuck with once in a while'."
-me
by Dave April 1, 2004
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A 9mmparabellum and .45ACP caliber submachinegun manufactured by Heckler & Koch, Germany. Also the sound Ted Kennedy makes if you knee him in the scrotum.
THWACK! "UMP!" Bingo!
by Merchant August 6, 2005
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When a person has made a catastrophic error of judgment
He’s only gone and umpsed it

What an Umpse, I’ve dropped the villages coveted urn - what a chunce-head I am.
by Fisherman George March 25, 2023
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Unidentified Meat Product. Extra meat on the vagina.
Connie has a large ump.
by Drewskizzy November 30, 2006
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