chopper (commonly pronounced choppa) is the nickname for the Thompson sub-machine gun a.k.a. the Tommy Gun. The word is derived from the sound it makes when being fired in full automatic mode which makes a chopping sound. The word is now used in pop-culture particularly in rap music to describe any kind of fully automatic sub machine gun.
You wanna bring beef well I got choppers in the backseat.
I went to the gun show today and picked up a nice chopper.
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