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Rule 38 is a prison offence in which someone is masturbating in public.
He got locked up because he kept doing a rule 38 in front of the female prison guard.
Rule 38 by Cereal KiIIer June 22, 2010
Related Words
38 38 hot 380 384 386 .38 Special 38 Special 381 38388 389
The time you tell people when they ask you what time they should show up to an event. Use this when you don’t care when the heck people arrive at something. Or just to be a dick.
Hey man! When should I come to the party?”
“7:38
“Really?”
“Bro, I don’t care. Just show up.”
7:38 by FebreezeBoi August 2, 2020

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 

You type this when you have way too much free time or are way too bored.
Teacher: lets count to 50!
Students: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50!
14:38 <CoJoNEsX> enter one for shrike
14:38 by ChefPogo March 31, 2004

P-38 Lightning 

The most gangster fighter aircraft of World War 2. Made by Lockheed, it saw a vairety of use. It may have been lacking in firepower, but it's speed, firepower, and versatility make it one of the greatest planes of the war.
I don't need a P-47, P-52, or a F-4U. Just give me a P-38 Lightning and I'll be happy
P-38 Lightning by PineappleDude January 15, 2006
Analogous to Rules 34 through 37, Rule 38 states that if something exists, there is a plushie of it, or there will exist a plushie of it. This is not a constant, but an inevitability; i.e. not all things have plushies, but come the end of time, they will.
"Half-Life 2: Episode Two had those really scary Hunter enemies; now they have them as plushies."
"Christ, Rule 38."
"WTF is rule 38?"
"It's like all the other Rule 3x's, but about plushies."

Rule 38 by Flatterland October 15, 2008