a US. 45cal. submachine gun from WW.II. little piece of sheetmetal that has one feature.

Load, press trigger, Splurrrrt!

no option for single shots, unless u have a very sensible finger.
don´t u fukk with me, got a greasegun from poppa in the shed.
by WHS June 02, 2004
Top Definition
The M3 Submachine gun. A cheap .45 caliber gun designed in WWII to replace the Thompson submachine gun. Since then, it has been used by the US all the way up to Desert Storm.
When the squad was surrounded, sargent mowed down the krauts with his grease gun.
by Jacob Stevens January 09, 2008
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