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A .45 caliber handgun or pistol, usualy used in urban slang such as rap.
Common to words such as tre deuce being a .32, deuce deuce being a .22.
"Looked up and I seen Swift shootin it out
But I can't see who he's shootin it out with
But Denaun's right behind him squeezin his four fifth"

-Eminem (one shot 2 shot)
by chris November 15, 2004
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Jan 22 Word of the Day
Whenever making a congratulatory remark, this is what you say. Made popular by Kamala Harris when she and Joe Biden won the presidency.
Sam: Wow, I can’t believe we just won that relay race!
Cat: we did it Joe 😭😭
by Zozogabobo December 04, 2020
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a .45 handgun

must write 20 letters
must write 20 letters
must write 20 letters
i keep my four fifth tucked in my button up
by thebay707yeeyeeyee! February 25, 2006
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another word used in place of saying forty five, a colt 45 gun.
man i got in the club with the four fifths, let some shit pop off iam ready.
by bert2 June 29, 2005
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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"
by C_Smith April 30, 2006
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