Yosser's Dozen 

A Yosser's Dozen is 9, three less than a standard dozen, and four less than a baker's dozen. The oldest source for the expression "Yosser's dozen" dates to the 21st century in one of Texas' largest suburban areas. Yusuf Khan was known to exclaim, "4 Dozen? That's like 36!", creating the phrase, Yosser's Dozen.

Hey dude, pass me about a Yosser's Dozen worth of eggs bro!

Oh man, I overdosed on a Yosser's Dozen of marijuana pills.

I bought a Yosser's Dozen loafs at the bakery yesterday.

Yosser's Dozen by Sensualtomato August 1, 2012

Masturbaker's dozen 

The pinnacle of all dedicated feckless cum-shedders whereby the participant aims to ejaculate more than 13 times in a 24 hour period. 13 loads in generally accepted by industry insiders as being the level that separates the men from the boys.

'I did it , I did the masturbaker's dozen! Admittedly the last six were with a floppy and the jizz was purely gaseous, but by golly I finally did it. Now it's off to the doctor for me to get some ointment for the blisters and tennis elbow..'

Masturbaker's dozen by Anonymous submissions December 10, 2016

A Cowboy's Dozen 

to buy as much of a desired product as one can afford with the amount of money one is carrying.

Cashier: Can I help you?
Customer: I’ll take some of those one dollar scratch-off tickets right there.
Cashier: Sure, how many would you like?
Customer: A Cowboy's Dozen (throws money on counter)
Cashier: (counts money) Soooo, seven then?
Customer: I reckon.
Cashier: Good luck!

Could also be used to exaggerate a story:
Derek: How much money did he say he won on that bet?
Jeff: A Cowboy’s $300.
Derek: Meaning?
Jeff: $200

A Cowboy's Dozen by iBetty January 10, 2012

idiot's dozen 

An idiots dozen is a number, typically 9, that's used as a similar reference to a baker's dozen but referencing an idiot.

He ate an idiot's dozen of cupcakes.

idiot's dozen by Rhym September 15, 2017

baker's dozen 

In the Medieval Ages there was a period when bakers began cheating the public at such a rate that public outcry reached the ears of several kings. As bread was a daily staple of Medieval life, the bakers knew that they could charge a lot of money for minimal portions of their products. As such, kings levied laws against bakers stating that they were to lower their pricesand keep honest. In fact the common term "A Baker's Dozen" (meaning 13 instead of 12) came from this time period. Any baker caught selling less than an even dozen was strictly and harshly punished. As a result bakers began adding one extra loaf to be certain their count would be correct or even over the amount decreed by law.

How many donuts would you like?
A baker's dozen, please.

baker's dozen by allygat-urr April 17, 2005

Negro's Dozen 

11

bitch only gave me a negro's dozen.

Negro's Dozen by Squamnail March 3, 2011

faker's dozen 

Eleven (11), a play on words of the term "Baker's Dozen"

With eleven points scored in the game, he had a faker's dozen.

faker's dozen by Sidelines February 9, 2010