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shifty fifty

unmarked police car

shifty = one who is sneaky
fifty = the fucking 5-0
I was doing 70 in a 35 last week, and the shifty fifty got me on radar.

sonuvabitch!!
by Ricky Roma January 2, 2004
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fifty

Fifty caliber.. a round of ammunition the bullet of which is a half inch (12.7mm) in diameter.

A common .50 cal round is the .50 BMG (Browning Machine Gun), the round which is (unsurprisingly) designed for the Browning .50 caliber machine gun.

The BMG itself is the large belt-fed machine gun known as a Ma Deuce. It was invented at the time of WWII but has remained in manufacture to this day because it is a very sound and effective design which it would be kinda hard to really improve on.

Now however there are a lot of other guns, including shoulder-fired rifles and even a single-shot pistol, firing the BMG round.

Fifty can also refer to the weapon used to fire .50 caliber ammuntion.
The Huey door gunner grinned and opened up on the Viet geurillas with his fifty.
by Dirge October 6, 2004
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Three Fifths Compromise

The optimal female to orgy ratio. An orgy containing three females and two males. This creates an orgy that is not only completely heterosexual, but also keeps the number of females and males close enough so everybody enjoys it.
Craig: Yo are you settin' up an orgy soon?

Nick: Yeah you know it.

Craig: How many girls you bringin'?

Nick: I'm settling for the three fifths compromise. Enough to keep it straight, but close enough to keep it fun.

Craig: Fuck yeah!
by Muammad October 17, 2013
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Fifth Grader

Someone who falls in the prepubesent age group who is very annoying, overweight, tags along with older sibilings. and thimks they know everything.
by Detroitlions Guy 34 March 29, 2009
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Dollar-Fifty

Second-grade joke where the victim is asked if he has a "dollar-fifty" (The quarters being testicles and the dollar being a penis) When the victim answers "no" he is then humiliated in front of his peers.
Tom: "Hey Chris, do you have a dollar-fifty?"
Chris: "No, why?"
(large amount of childish laughter)
by -Special Ed- December 6, 2009
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fifth challenge

A contest between individuals in which each participant is given a fifth of liquor of their choice. The objective is to drink the fifth before the end of a designated time period, typically the end of the night. True champions are known to use Bacardi 151.
Paul: Yo Diaz, you have 30 minutes left to finish the fifth challenge

Diaz: Shit man, that's like 5 more shots.
by PaulCP April 8, 2006
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fifties slide show

A classroom slideshow that educates you through fear. They all have the same narrator and use some kind named Billy as an example, something bad always happens to Billy.
Fifties slide show examples:
And thats why you should never talk to strangers. Because they all have knives. Isn't that right Billy? Billy wouldn't know. His mangled corpse is now being raped by a depraved psychopath, all because he talked to the local ice-cream man. BOO!
by Wesley Durrance September 19, 2005
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