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January 18

My moutherfucking birthday bitch
Hey it’s January 18 aka my moutherfucking birthday
by Pancake 33 October 15, 2019
mugGet the January 18mug.

August 18

Percy Jackson's birthday, hence the almost-best date in the world--second only to May 2nd, the epic date when Harry Potter defeated Lord Voldemort at Hogwarts.
by 7.5Fan July 20, 2011
mugGet the August 18mug.

September 18

Only the elite are born on this day.
People born on this day are Hot, Thiccc, Intelligent and Funny! They’rea great friend and you should make an effort to be around them!
Bryan: Hey do you know why Julie is so intelligent, Hot asf, thiccc and funny
Nic: She was born on September 18
by thicccyyy_niccciii. thebaddest September 8, 2020
mugGet the September 18mug.

May 18

The badest bitches were born PERIOD
IF YU WERE BORN MAY 18 YU A BAD BITCH
by Datbadbitch October 15, 2019
mugGet the May 18mug.

April 18

Cute girls with issues were born on this day.
April 18 is a bad but good day to be born
by Stanky, fishy December 6, 2019
mugGet the April 18mug.

Gsh-18

The best weapon ever created by man. Its utter power and destruction can wipe out entire civilizations. This is a weapon to bow down to. Commonly found in Rainbow Six Siege, anyone who takes it gets the power of pure annihilation. When combined with the Lord Tachanka himself it creates a strength never before seen.
Ben: How did he headshot me in the foot? He's hacking!

Jeff: Dude chill, he only killed you because he had the Gsh-18.

Ben: Damn, my bad. I forgot the complete annihilation it possesses.
by Pulsar Plays December 1, 2018
mugGet the Gsh-18mug.

18 syndrome

A condition that afflicts a growing number of newly-minted legal adults. It is characterized by the assumption that reaching the age of majority is carte blanche to do whatever one wants, regardless of any amount of protest from parents, authority figures, or even common sense. Most sufferers are observed stating something to the effect of "I'm 18, so I can do what I want!" upwards of twelve times daily, usually preceding a poor decision or the planning of one. Ironically, sufferers of 18 syndrome are often the most poorly-equipped members of their peer group when it comes to making decisions.

This condition is alarmingly prevalent among 18-year-olds who, despite being adults legally, lack nearly every quality that makes one an adult practically, e.g. responsibility, self-sufficiency, and maturity. In fact, the vast majority of sufferers depend on their parents for their livelihoods and still have close to a year of high school ahead of them. It afflicts both genders more or less equally, but a good rule of thumb is that it tends to produce bad decisions that cause physical harm in males and ones that cause emotional harm in females. Thankfully, beyond annoyance to others and the repercussions of the bad decisions it can frequently encourage, 18 syndrome is mostly harmless, and it seldom lasts beyond the age for which it is named.
"What's going on with our neighbor Martha? I know she's a smart girl, but yesterday I saw her tell her parents that they could fuck off because she was 18 and then drive off, cigarette in hand, with a pretty creepy-looking older guy. I'm worried for her."

"Don't sweat it. She just celebrated her birthday yesterday and now she has a really bad case of 18 syndrome."
by wearsmanyhats October 25, 2013
mugGet the 18 syndromemug.

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