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13th month

Januember, the 13th month of the year, was created by philosopher Elon Musk in the year of 2069, on April 20th. The month was created to make the year 2069 one month longer, so people would be able to enjoy it longer. The month is only put in action in 2069 though.
"Hey, its 2069!"
"I'm so excited for the first and last ever 13th month!"
by Nathan's Username October 18, 2019
mugGet the 13th monthmug.

December 13th

December 13th is the day where sMeXy💕 people are born.. soo sLaP thEm iN tHe bAcKkk 😈
your birthday’s December 13th Emily? THeN u GeT a SlAp
by typical_addri November 13, 2019
mugGet the December 13thmug.

13th grade

Derogatory term used to describe one's crappy local community college. The community college is seen as both lacking in real collegiate educational value and additionally using no discretion in its acceptance of every single applicant. It is described as the 13th grade to imply that it is merely an extension of public high school. It is considered only one step above going to beauty school or training in air conditioning and refrigeration repair.
"Judy didn't get accepted by Trenton State, so she's going to the 13th grade"
by titmouse August 1, 2006
mugGet the 13th grademug.

13th base

Sex with your boss, professor, or another person you have no business fooling around with . . .
"I did not have sexual relations with that woman . . . it was just 13th base!" -- Bill Clinton
by Scylla June 29, 2006
mugGet the 13th basemug.

13th Floor

Due to superstition in most countries about the number 13 being bad luck, this particular floor of a building is usually named the 14th floor by the elevator console.
Harold: I want to go to the 13th floor of this building.
Earl: There is no such thing as the 13th floor in this building.
by Mojo Maniac August 8, 2008
mugGet the 13th Floormug.

February 13th

The holiday when you break up with your significant other so you will not waste money on them on February 14.
Mike: it's finally February 13th time for me to break up with Jane.
by Kingslayer3000 September 8, 2016
mugGet the February 13thmug.

Friday the 13th

1)n. A day that is said to be cursed. This day is said to be cursed because it is associated with the number 13, said to be unlucky. While any day that takes place on the 13th day of a month can be unlucky, Friday is chosen as the unlucky day because the superstistious people who believe in the nonsenical legend of Friday the 13th in the first place wanted so badly to screw up the second best day of the week.

This day, for some, can be like any other day, and for others might turn out better than other normal days. Any unlucky occurences that occur on this day are entirely coincidential.

2)n. A friday like any other, it just happens to fall on the 13th of the month.

3)n. The title of a film that is a reference to the above mentioned day and the bad luck it brings. This film was released in 1980 and is an early film in the slasher genre. In this film the mother of a boy who drowned while swimming at Camp Crystal Lake goes on a killing spree on her sons birthday, which falls on Friday the 13th
1.today is Friday the 13th. we will all experience bad luck today.
2. have you ever seen friday the 13th?
by eric optimus prime cartman January 17, 2012
mugGet the Friday the 13thmug.

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