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SDI
Monday-
You: What'd you get on your test?
Me: I failed :(
You: Hahaha. Good job, fuckhead.
Friday-
You: Dude, I totally just failed my test in bio :(
Me: SDI. XD
You: What'd you get on your test?
Me: I failed :(
You: Hahaha. Good job, fuckhead.
Friday-
You: Dude, I totally just failed my test in bio :(
Me: SDI. XD
SDI by Margo Roth Spiegelman II April 14, 2009
sdi
"Stratigic Defense Instatute". It could be some kind of super secret military organisation so secret that nobody knows the slightest damned thing about it. Or the previous description simply matches the wet dream of some guy, when in reality it's just the "company" name of some guy who made an unlicenced Star Trek board game.
Synonym: 'pathetic'.
Synonym: 'pathetic'.
"I am not the computer wiz! Dr.'s Bob and Geodude have that responcability. I've told you all before, It's not my yob, man!"
sdi by Lord of the Farce April 7, 2004
SDI
imaginary instatute made up by a 1337 master of "tai qwan doe" who is richer than god and lives in his parents' basement.
either that or a really sad 50 year old
either that or a really sad 50 year old
SDI by General Zod April 7, 2004
SDI
SDI by whereismyfood November 28, 2018
Sunset District Inc/Irish (SDI)
Sunset District Inc/Irish. In the 70/80's a rough group of white boys. 90's and beyond...more myth than reality, but still around.
Sunset District Inc/Irish (SDI) by goast April 15, 2013
sdihs
More from Urban Dictionary
kidulting
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
Boffin
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”
Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.