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1 definition by Alo4Sho

 
1.
A sexual term to pleasure not only yourself, but the person sitting next to you as well. You must grab not only your penis but your neighbor's penis at the same time. Start pumping at full throttle; Once both of your bodies are shaking out of control, and you both have succsessfuly ejaculated onto yourself you have acheived the Tommy Gun.
I heard that Alex has been giving Tommy Gun lessons for so long that he only shoots blanks.
by Alo4Sho May 20, 2008