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Adjective: The resulting mental state of mind after ingesting more than copious amounts of alcohol.

Generally prefaced with "God damn son." The phrase initially denoted how many beers it took to reach this stage, it has since expanded to any form of alcohol, and the number "15" no longer necessarily denotes how many drinks you've had, but has rather maintained its position in the phrase as a means of tradition rather than literalness.
"God damn son, I'm 15 in and ready to but fuck." (incorrect spelling of "but" is required when written or typed)

"Son, I'm 15 in."

"God damn son, this bar would be a lot better if we were 15 in"
15 in by antwood October 13, 2011

that's why you're getting a 15% in english 

When you can't speak properly or gets words messed up while speaking, writing, reading, spelling, etc.
What's the type of English course?

Media studies.
No, its OPEN! That's why you're getting a 15% in English.

The Coding Artistry Starts At 3.25Ms And Ends In 15 Hours....Nigga Goddman IT! 

The Coding Artistry Starts At 3.25Ms And Ends In 15 Hours....Nigga Goddman IT!
The Coding Artistry Starts At 3.25Ms And Ends In 15 Hours....Nigga Goddman IT!

In my 15 years of teaching... 

When the teacher sits on her desk and says this, you *know* the entire class failed.
Friend: hey what did you get for math finals
You: I's got an f+
Friend: Oof
You: ikr
Teacher: *sits down on desk*
Friend: oh no here it comes
You: what comes?
Teacher: In my 15 years of teaching... I have never seen so many people fail the finals. It's literally THE FINALS!
*continues ranting for 3 hours*
Teacher: *takes a deep breath* Ya get that!?
Everyone: omfg finally

Fuck you in your 15 holes 

An outlandish statement, only used to insult and denigrate the very worst douchebags, assholes, and degenerates.

It is a common truth that everyone has at least 15 orifices hidden on his or her body. Girls usually have at least 20 hidden ones, however.
Douchebag: Hey yo imma fuck u up if u dont do my algebra homework

Sensible human being: Fuck you in your 15 holes, you fucking jackass!!

Douchebag: .....fine ill leave u alone, jeezus
Fuck you in your 15 holes by Tofu-san September 19, 2009

pen 15 all up in ya Sh!t

undoubtedly the coolest phrase ever created

period

no exceptions
Jason: Guess what.
Matt: What?
Jason: Pen 15 all up in ya Sh!t

HP - Envy x360 2-in-1 15.6" Touch-Screen Laptop - AMD Ryzen 5-8GB Memory - 256GB SSD - Nightfall Black

Hey mom, can i buy a HP - Envy x360 2-in-1 15.6" Touch-Screen Laptop - AMD Ryzen 5-8GB Memory - 256GB SSD - Nightfall Black please?