What is Four-fifth?
1.
noun, slang.
an urban or slang term used to describe a .45 caliber pistol.
origin: southeastern Virginia (Virginia Beach/Norfolk), Newport News
"hit 'em with the
neener man/
or that four-fifth guaranteed to lean ya, man, whoa" - Malice of the Clipse, on Baby's "What Happened To That Boy"
See