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1) To extract the fun out of something, to render something boring and or painful, to ruin something
2) A keyword in the LISP programming language
John: Let's play with the ball at the beach!
Mike: We can't, we have to study for the test tomorrow, and we have no hand-eye coordination, we're engeniering students remember?
John: You just defun my day. You defun everything.
Defun by pr0gramm December 28, 2013
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to kill happiness slowly by making rules or changing subjects to current things people hate, or the process of being a killjoy.
When Bill started to take peoples feet off the couch and talk about Iraq, he started to defun the party.
defun by John Westbrook July 1, 2008

defenescate

(v.) The act of throwing one's excrement out the window (especially when experiencing plumbing issues in another's home that may lead to greater embarrassment than the act of defenescating itself).
When the toilet failed to flush when I visited my future in-laws for the first time, I felt compelled to defenescate rather than own up to my unsightly mess.
defenescate by Misfits Doing November 23, 2022

Israel Defense forces 

The military of the country of Israel. They consist of the ground forces, airforce, and navy. The IDF is also known as one of the most modern and elite military forces in the middle east/ mediterranean area. The IDF is unique in that it has a large amount of female service people and it has a very close relationship between the ground forces, airforce, and navy. The technologies used by the IDF are mainly American, but they do use many native weapons, like the Uzi, Tavor assault rifle, galil assault rifle, Negev light machine gun, and jericho pistol. The airforce uses both american f16s and f4s, as well as european fighters. The airforce also use the american blackhawk and huey helicopters as well as the apache longbow attack chopper.

Ground forces use many american technologies as well, such as the Humvee, m4 carbine, barret m82 .50 cal, and other small arms. However, the IDF has made use of different Israeli-made armored vehicles and the merkava tank, internationally recognized as one of the most formidable and modern tanks on earth.

Israel has been a close ally of the US for years, due to their constant economic trade and America's military supply of the IDF. The IDF's current enemies of greatest threat are the terrorist group Hezbollah, the paramilitary group of gaza called Hamas, and many believe Iran as well due to their military aid of these terrorist factions.
The Israel defense forces are relatively small, but they are damn dangerous.

Shaggy Defense 

When someone is caught committing a crime (mainly one sexual in nature, but can refer to all crimes), with overwhelming evidence to prove they did it; in their defense, the culprit denies that they were the one caught doing the crime.

Derived from the Shaggy song "It Wasn't Me", which describes a man being caught having sex with another woman by his wife, and subsequently denying that it was him she actually saw.
When caught on video having sex with a 14 year old girl, R. Kelly employed the Shaggy Defense; he just denied that he was the one in the video.

i, evax humbly submit a toast to nicholas alexander for successfully managing to pirate warcraft iii so he may play defense of the ancients. congratulations, nick. enjoy your dota. 

I, EvaX humbly submit a toast to Nicholas Alexander for successfully managing to pirate WarCraft III so he may play defense of the ancients. Congratulations, Nick. Enjoy your dota.

Sex defender 

Someone is being sexually assaulted by a Sex offender and nobody is there to help. What do you do?

1. Join
2. Escape
3. Call the Sex defenders

Correct answer: 3. Call the sex defenders
A: "Oh no, she is being assaulted by a Sex offender! What do we do?"
B: "Call the Sex defenders!"
Sex defender by Sukoforiko January 14, 2021