Dictionary.com
definitions

burp gun

See more synonyms for burp gun on Thesaurus.com
noun Military.
  1. machine pistol.

Origin of burp gun

An Americanism dating back to 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for burp gun

burp gun

noun
  1. US slang an automatic pistol or submachine gun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012