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Fly 13

Fly 13 (Verb): To engage in any; whether subtle or outright, act or display of incest.

The 13 refers to the number of stars on the Confederate (CSA) flag, which in recent years has been memed as a symbol of incestuous deeds, as well as a number of other redneck shenanigans that typically take place in America. So, to "fly 13" (Fly the flag with the thirteen stars) would mean, as a modern metaphor, to support or proudly take part in incest (Sexual acts or feelings taking place among siblings or close relatives).
Ellen: Fuck you Jack! Mom's gonna take us to Auschwitz if she sees the mess we've made!
Jack: Hey! You started it, I had nothing to do with this until you interfered!
Ellen: Playing innocent now? Suck my cunt!
Jack: Woah there, fly 13 I guess...
by JustAnotherSickFuckOnUrbanDic December 25, 2022
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october 13

the perfect day to commit suicide while drinking piss
‘oh it’s october 13, let me just pee in a cup and drink it while i try to kms!!’
by suicidalshinnie November 22, 2021
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13 December

N: Let's kiss
M: Why?
N:it's 13 December, kiss your best friend day
by Yourmom🚩 December 3, 2021
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November 13

You: Hey you know what day it is?
Friend: November 13 why do you ask?
You: you ow me 5 dollars!
Friend: Fuck
by Crim November 12, 2020
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January 13

National Simp day. January 13 is the day that the boys pipe up, shoot their shot, and kiss their crush. Or if you already have a girlfriend, show her some affection, give her a hug and a kiss, tell her she's beautiful.
Girl: 'Oh hey Jake wha-"
boy: "*kisses*
girl:"wtf!!!"
boy: " im sorry. didnt you hear? its January 13, national simp day."
girl: "ohhh okay."
by CarmelxCow January 12, 2021
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December 13

Ignore your gf/bf for the day!
December 13!!!
by ominous person lol December 10, 2021
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September 13

Virgo that knows how to fuck, might not last the longest but they’ll make sure you finish, doesn’t mind giving head, very open to new ideas and wants to make everyone happy.
“That was the best my pussy has ever been eaten”

“Yeah he was born on September 13”
by The wizer guy December 24, 2021
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