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two-thirds-your-age-plus-six 

It's a rule for the range of people you can date.
If you are 99 years old...
99*(2/3)+7 = 73
73 - 99 years is the range of people you can date younger than you.

examples:

10 years = 10-13.6
14 years = 14-16.3
16 years = 16-17.6
18 years = 18-19
20 years = 20-20.3
30 years = 27-30
50 years = 40.3-50
99 years = 73-99
You can't date her, she's 33 and you 23... use the "two-thirds-your-age-plus-six" rule dude.
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Dirty Thirds 

You did?! So did Joey Yanks and Jay 420! You got dirty thirds!
Dirty Thirds by OpieTaylor July 8, 2011

Two Thirds 

One out of three children born with a working brain.
Hey, did you see two thirds today, or is he helping his sister off of the short bus?
Two Thirds by cletus&cooter August 1, 2003

sloppy thirds 

A foursome, with three dudes, and triple pentration.
Yea, I cant believe she handled all of those sloppy thirds. Each third was so sloppy, but together they are sloppy thirds. When one left to use the restroom, it was temporarily sloppy two/thirds.

thrifty thirds 

To get busy with someone's lady bits right after the SECOND guy does. A degree beyond "sloppy seconds."
M: Imagine being the third wife in a polygamist family...You're not getting sloppy seconds, you're getting THRIFTY THIRDS!

B: Woah. Yeah...
thrifty thirds by MazzaHelsing November 7, 2011

Trifling thirds 

Fucking a cunt minutes after the previous two guys, using their cum as lube. The follow up category of Sloppy Seconds.
when in a foursome and you are the last guy to fuck the cunt, you are considered doing trifling thirds.
Trifling thirds by chocolatethunder65 September 28, 2009

Two Thirds Effect

Where any song is slowed down by two thirds of its length. commonly experienced by a lack of proper timing.
Take me to church becomes Taaaaaakkkke meeeee to chuuuurrrch is a common example of Two thirds effect
Two Thirds Effect by JumpingJ January 20, 2016