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3.
A 50 50 is short for Five O driving a 5.0.

Many police forces in the United States employ the use of marked and unmarked Ford Mustang police cars with powerful, sport tuned, high-horsepower, V-8 engines, commonly known as the Mustang 5.0 (Pronounced five point oh), or Mustang GT.

The purpose of these vehicles is two-fold. Mainly to catch unsuspecting speeders who might ordinarily recognize a typical unmarked police vehicle such as a Chevrolet Impala or Ford Crown Victoria.

A secondary, less frequent use of the Mustang 5.0 is to give a police force vehicles suitable for use during high speed chases with motorcycles, exotic sports cars, or modified vehicles. Ordinary patrol cars are not capable of attaining the high speeds sometimes encountered during chases with the aforementioned vehicles. These ultra-high speed chases can sometimes reach 150 mph, or more!
Slow down man, that's a 50 50 tailing us! Thanks Dude, I didn't even see him. I can't afford another ticket or I'm gonna' lose my f'in license!
by Javaking_1000 March 21, 2010
 
1.
1) A 50-50 is a skateboarding/snowboarding trick where you jump on to a rail, and grind the rail with your body parallel to the rail. This trick is the base for 5-0s, Nosegrinds, Crookeds, and Salads.

2) A 50-50 on a pipe is where you come up to an Axle Stall at an angle, and get on to the coping in Axle stall style, then you slide along the coping a little, then you drop back in.
50-50s are a simple, yet tight trick.
by Ricky Benda May 23, 2005
 
2.
The 50-50 is a very mutual and sexual act performed by two people. To perform the "50-50" you will need to have a tub of Nutella and an anus. Scoop out a reasonable amount of Nutella onto the finger and insert into the anus. Allow 5 minutes rest and then with your tongue, lick inside the anus. There is a "50-50" chance that poo or Nutella will come out.
"Hey mum, can I 50-50 with the Nutella this week?"

"Hey babe, I was wondering if I can 50-50 you tonight?"

"The last time I 50-50'd someone I got poo on my tongue!"

"I'm not too hungry tonight. I might just have a 50-50."
by mclanky andrew November 03, 2013
 
4.
When a woman give a man a hand job but with her feet
dude you know that chic from the bar yeah, well she 50-50'ed me under the table last night
by Collin Danaher March 29, 2006
 
5.
Game played when you are unsure if you're going to fart or shit. The probability is usually equal.
If you pull my finger, we'll play 50-50.
by Joel TK May 25, 2005
 
6.
Used to address the 55 class of Mercedes-Benz cars. Such as the S55 and E55 sport sedans.
"Nice, check out that E 50 50 over der."
by MBZ November 29, 2004