69 is the sex number. 69% of the world thinks dirty thoughts.
If you are dirty minded you will understand this joke.
My teacher asked me what came after 69.
I said mouthwash.
The magic spell that harry ingeniously used during the "sidemen go back to school" video.
A number that's lower than the average IQ of Urban Dictionary users.
You know what that means?
Nice.
Customer: "How much is that?"
Cashier: "69 cents"
Customer: "Nice"
For some reason, humans appear to find this number humorous due to it being related to a method of procreation, it is unknown why they find sexual intercourse humorous.
“Hehe 69, nice.” -Human Subject #058.