back 40

a rural reference to the "40 acres behind the barn"

When George Bush returns to Crawford, Miss Laura will ask him to clear the brush on the back 40.

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.40 cal

First introduced by Smith&Wesson in 1990. Ballisticly similar to the 9mm parabellum, but with muzzle velocity exceeding all 9mm loads, and exceeding most standard loads of the outdated .45ACP cartridge, while having a standard magazine capacity of as many as 15 rounds (G22) as compared to the 7 round standard 1911 magazines, or the awkward-to-hold 13rd G20. Despite the belief or most inexperienced with the round, the .40 S&W has noticeably more recoil then the .45ACP.

Ironically, Austrian manufacturer Glock beat Smith & Wesson to the dealer shelves in 1990, with pistols chambered in .40 cal.

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Room 40

A fictional place used to introduce deez nuts to someone.

A: "Do you know about room 40?"
B: "What's room 40?"
A: "Room four deez nuts, got'em!"

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40 water

A vitamin water that is made by E-40 and the makers of hyphy juice.

I was at 7-11 yesterday and I bought that new 40 water and it was amazing.

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D-40

what someone does as a job

"whats their D-40"

"oh well sarah's a interior designer and geralld works for marketing"

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40 and a blunt

The act of holding a 40 ounce bottle of malt liquor and a marijuana blunt in your hands.

Gangsta #1: I'll be hanging around the hood all day drinking a 40 and smoking a blunt!
Gangsta #2: Yeah, a 40 and a blunt is always a good combination! Let me hit it too, homie!

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freshman 40

The extreme version of freshman 15, with today's obesity, many teenagers are finding trouble with weight entering College.

Person 1: Wow, I haven't seen Robyn since last year?
Person 2: Yea she definately got hit hard by the "freshman 40"

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