Apollo 18 

A horror movie that for the most part, is Paranormal Activity in Space

Apollo 18 wasn't bad, but it was kind of a let down as far as I'm concerned

Apollo 18 by Metallicajunkie September 30, 2018

AK 18 Games 

AK 18 is the best Rainbow Six Siege YouTuber out there. With his 24 Subscriber, he is one of the greatest YouTuber of all time. His Videos are highly quality and amazing content. Subscribe now to AK 18 Games

YouTuber AK 18 Games

AK 18 Games by AK 18 May 9, 2019

RU/18 

Texting code to ask if the person is over 18 years old
Ru- are you
/- over
18- 18 years old

Guy 1: That girl in the club is over 18 who's number you got right?

Guy 2: not sure, let me text her
RU/18?

RU/18 by Koolcat55 May 17, 2019

DAY 18 

After 18 days of homoerotic exercise, a bear does 18 push-ups while a twink either does/doesn't join in. This is commonly filmed and sent within a community of people. The twink usually masturbates to the activity, while the bear sweats profusely and his bones crack in pain. (Some versions of the activity include the bear having an erection that has to touch the floor in each push-up.)
Upon completing the 18th push-up, the bear will moan "urgh, DAY 18" and the twink tries to ejaculate at the same time.

Person 1: "Ah bruv, me and my Bear are gonna do day 18 today"
Person 2: "Ah my guy bruv, have fun g"

DAY 18 by MNO_BRW July 26, 2019

October 18 

October 18 is national ride a dick day! This can only be done by your homie/boyfriend/girlfriend/crush and if it's allowed, any random person.

You might think it's wrong and fake but this is official

national ride a dick day©

Henry: "Yo bro wanna ride my dick?"

Adam: "No bro, it's not allowed, oh wait it's October 18th right, then it's okay bro"

Henry: "Bro"

Adam: "Bro"

October 18 by Shuokij October 15, 2019

June 18 [Kpop] 

the day Son Hyunwoo (Shownu), also known as the leader of Monsta X and the legend was born

June 18 Kpop is the birth date of the legend, kpop king and sweetheart Son Hyunwoo

June 18 [Kpop] by shownustannumber1 October 15, 2019

October 18 

October 18th is the day any boy can punch/slap/kick any girl with or without her will

"Hey Brian it's October 18th! "
"Let's get that bitch Tiffany back! "

October 18 by Jotaro's Hot Dolphin October 16, 2019