When on uses the excuse of being an alcohlic to justify doing something incredibly stupid or unorthodox. The term was originally coined after Mel Gibson repeatedly used the excuse of being an alcoholic for doing stupid things; notably making the Passion of the Christ.
Jerrell: Yo, that guy just got raped by that Frat Boy 12 times in an hour!

Liam: Yeah, but he's got the Mel Gibson Defence.

Jerrell: True dat. Hey, you thinking what I'm thinking?
by zilchonocomprendo April 14, 2009
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A lame excuse to get out of something you said that you'd
do, but can no longer be bothered doing, such as donating
a large amount of money to a charity, doing jail time...

AKA: Paris Hilton Defense (US spelling)
"I promised to help my friend move house, but I just went with
the Paris Hilton Defence."
by ChrisGrrrr June 7, 2007
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An excuse to get out of a sticky situation by coming out as gay, and thus attempting to undermine the whole point of the allegation.
Guy 1: So I owe you some money after a game of poker. I don't remember this ever happening though and I deeply apologise, these allegations have made me address other aspects of my life and it is now that I choose to live my life as a gay man.
Guy 2: Dude don't use the Kevin Spacey Defence
by OctagonDinosaur November 3, 2017
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Argument used to justify perving over underage girls, by claiming that because they're now 'legal' it's OK to have been fantasising over an underager.
"It's not peadophilia to wank off over Stephanie, she's 18 now' protested John, invoking the Lazy Town Defence when Susan caught him with his penis in hand whilst watching old episodes of 'Sabrina'
by The Amorous Badger January 29, 2009
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Tower defence simulator is an amazing game on roblox lead by BelowNatural. The games goal is to survive waves of zombies by placing towers and upgrading them, the more waves, the stronger zombies. By winning you get coins to get towers and pointless emotes. You can also try out hardcore mode.
Did i mention updates come once a year?
Jeremy: I personally think Tower Defence simulator is the best game on roblox!
Jimmy: But updates in Tower defence simulator Come like once a year dude.
Jeremy: Oh i forgot.
by ZephyraWasTaken February 1, 2021
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when someone slams the tory government, they bring up Labour's faults despite not being in power since 2010
I can't think of an argument so I'll use the Boris Johnson defence
by WelshNutter July 29, 2022
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The act of attacking someone under the ruse of self-defence, purely so they don't even get a chance to attack you. Usually happens in a bar or other locations that could have disturbance.
Person A: Giving me skittles should apply to you doing any Glasweigan things, such as bottling women, and taking heroin. Deep fried foods are okay, if it's fish. Anything else, a skittle.

Person B: then I'm gonna end up spending my student loan on a box of skittles and sending down south to you.
haha

Person A: I can live with that

Person B: well deep fried foods I tend to avoid anyways - healthy diet for hockey! haha!

Person A: Well try to stick with it! Bottling women should be okay but the taking heroin.Well actually, it's incredibly smart if you think about it. The heroin and the deep frying cancel each other out

Person B: and the bottling is self defence??

Person A: Pre-self defence.

Person B: ahhh yes
by James Frost January 31, 2011
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