A pun is a clever use of words that usually makes the listener, or rather, victim, do one or several of the following:
Laugh
Smile
Face palm
Groan
Roll eyes
Pretend to ignore
Cry
Swear
Die inside.
Puns in their most common form are very simple to make, and take almost no amount of intelligence to understand; Orange you glad you're reading this?

Puns of this form are the funniest.
A person who makes good puns is considered "Punny".
The making of puns is a very prestigious but often unappreciated art.
Forests are full of wood.
People use wood to make chairs.
Chairs are for-rest.

Maybe I should leaf the internet

*Points at fish habitat*
I went to the tattoo parlor the other day, and the guy inside asked me: Would you like to hab-i-tat?

*Gets out of car*
That was a wheel-y tire-ing day.

*During a Storm*
Woah, look at the wind doe, through the window.

Anne Frankly, I did nazi that coming. Did jew?
"Did Jew" was the neinth pun in these examples.
You're ruining my concentration. Camp you quiet down?
Well, I gas I could.
Auschwitz one was the best? Israeli hard to choose.
via giphy
by Kentucky Fried Trump June 17, 2016

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A noun used to represent a form of play-on-word that dwells on taking advantage of similar sounding words or different definitions/implications of a certain word or phrase, generally used for comic relief, or to express your own cleverness and distaste of others' sanity. Not to be confused with double entendre. A well crafted pun requires both flow of pronunciation and well-layered meanings.
My friend made a pun while waiting to get his juice refilled. Here comes the punch line.
by Robophant December 05, 2015

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something that should have died a long time ago
Ha Ha Ha that's so punny
via giphy
by zenthon05 October 25, 2016

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a play on words.

(a very good way to get slapped by someone)
Person 1: How come I only have $20 in my wallet?
Person 2: Probably because you spent it on useless crap.
Person 1: Now that makes 'CENTS'
Person 2 : That was terrible! You need a PUNishment for that
by chicken pen15 July 09, 2016

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Play on words
"Did you know I used to be a banker?" Dal asked
"Why did you stop?" you reply
"I lost interest"
"Talk about a bad pun," you tell him while you shake your head. You began to walk away never never to look back.
by Layla912793 September 27, 2015

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Call me Repunzel.
You wanna hear a pun?
Sure, I'm Rapunzel!
That's not very punny.
by Eastern Wildebeest June 27, 2017

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joke
good pun
by vele June 20, 2016

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