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An expression used, usually in text messaging language to represent one laughing or that something was funny.

Originally derived from the mobile telephone keypad at which "Ha ha" would be 42 42.

Has become increasingly popular in speech with people using it as an adjective. Instead of laughing, to show that something is funny, one would say "forty two". Refer to example below.
Text message:

Person A) "I saw someone tip a cow."
Person B) "Really?! 42 42"

Speech:

- "He pulled a prank on his brother that made him pee his pants."
- "That's forty two."
42 42 by MrJARichard May 6, 2009
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42-42-564 

Soul Eater, Episode 1 - Resonance of the Soul...

Maka: "The number to the death room is... 42-42-564 (shini shini koroshi)
42-42-564 by mmergan June 25, 2017
Related Words

Catch-42 

A catch-42 means to think the unthinkable, make the impossible possible, or turn a seemingly hopeless or paradoxical situation into a solvable problem. The result is a groundbreaking realization that takes us beyond our imagination and fundamentally changes our way of life and view of the universe.
Newton’s law of universal gravitation or Einstein’s theory of relativity are prime examples of catch-42s.

This morning I woke up and had catch-42. Now I know how to make a Quantum Computer work.
Catch-42 by Felipedia December 17, 2020

The_Number_42 

A person that cannot make his decisions on his own, and won't listen to common sense or helpful advice.
Dude stay off of discord for a while, don’t be like the_number_42!

42-39-56 

The breast-waist-hips measurements of 'Rosie' in the AC?DC song. The stereotypical ""perfect"" woman would be 36-24-36, a life-size 'Barbie' would be 39-19-33 (and she'd be 7ft-2in and 110 pounds).

According to legend, she's a real woman from New Zealand with whom then lead singer Bon Scott had sexual relations. In addition to her size, Bon Scott often said she was his most talented partner ever.
42-39-56 you could say she got it all... that's a whole lotta woman..... a whole lotta Rosie!
42-39-56 by TreeJay January 15, 2010

The 42 maneuver 

The act of activating self destruct in, or parked near another spacecraft of much superior firepower. Usually performed with the lowest of grade or quality ship as to seem harmless during the act.
That guy out there is boasting about his new ship, and I just saw someone land in his hanger. Looks like he's about to preform the 42 maneuver.
The 42 maneuver by Drakenstien September 3, 2021

P. Sherman 42 Wallaby Way, Sydney 

An address you'll remember after having to watch Finding Nemo.
Guy 1: "Do you know where I can find a clownfish?"

Guy 2: "Did you check P. Sherman 42 Wallaby Way, Sydney?"

Guy 1: "What the......is that place even real?"

Guy 2: "Didn't you watch Finding Nemo, of course it's real!"