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1.
The purest of pure GOLD tops off at 99.999% (0.001 is some other shit) AKA: Five nine! Therefore, something that is staight up, maxed out to the tits, top of the line is 'The five nine' or 'the 5 9' if you don't wanna spell that shit out.
Yo ma'fukka, check out this prime chronic I be rollin'. That shit's the FIVE NINE, nigga!

Oh my gosh, fellas! Look at the kaboose on Sally. I dare say it's five nine quality SHIT! Blah-DOW!
автор: Jimbizzy Fo Shizzy 28 октября 2006
 
2.
five nines, as in 99.999%, something that is the absolute best in category. better than anything else out there.

For a geek, "five nines" means 99.999% uptime for your server, less than five minutes per year. For humans, it's something that's just over the top good all the way around with a big exclamation after it.
Your new girlfriend is fivenines. Nice one.

Did you see that movie with Val Kilmer? It's fivenines.

Your car rocks, it's fivenines.

Urban dictionary? It's fivenines.
автор: Derek Dakota 21 августа 2007
 
3.
An affectionate term in place of for the man you love when he's actually 5'8" or shorter but thinks he's taller.

Used in conjunction with Skot
Hey fivenine it's been over a day, i miss you
автор: puppyfat 20 сентября 2010
 
4.
Referring to the amount of uptime a server has had. 99.999% Reliability. Similar to Five nine - but specific to another context.
For this mission-critical project, we have to host our database with a service provider who's datacenter is Five-Nine.
автор: fogboy 19 октября 2007