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When Fridays fall on a prime number in the month such as the 2nd, 3rd, 5th, 7th, 11th, 13th, 17th, 19th, 23th or 31st calendar day of a month, it is customary and mandatory to say inappropriate things, especially in office environments that are traditionally governed by more serious behaviour.

This concept was introduced in 2013-2014 in the London financial industry, initially to be able to shed the burden of formalalities and hierarchy in the office.

The intent of the inappropriate comments is to be witty and funny.
- why don't you tell Martha to strip down her clothes for the customer.

- I can't ask her that...
- sure you can, its inappropriate Friday.

- brandon, you are so dumb, you should just roll over and sleep
- oh my god, you can't speak to him that way
- sure I can, but only on inappropriate Fridays.
by InappropriateGod September 08, 2017
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