Named after the Thompson sub-machine gun, it's a slang term used to describe someone masturbating until the ejaculation of blood. Can be used as a noun or verb.
1.In sixth grade, Mr. Young convinced Tom to pull a tommy gun.
2.The next day, Tom couldn't skate because he was too busy tommy gunning.
by Tyred December 18, 2005
Name given to a selection of automatic weapons that used cases of bullets; primitive magazines.
Tommy gun up yo ass.
by Gumba Gumba March 16, 2004
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