slang term- a gun that can be used and thrown away because it was relatively inexpensive.
I have a glock 9 but when I want to kill someone, I use a cheap throwaway 22 caliber rifle. Basically I pull up to a nigguz house and wait. Then I see him in the scope and I bust a round in his fuckin head. The rifle only cost $110 so I throw it away after I clean the fingerprints off.